<SUBMISSION>
<ACCESSION-NUMBER>0000950135-06-007527
<TYPE>S-8
<PUBLIC-DOCUMENT-COUNT>3
<FILING-DATE>20061220
<DATE-OF-FILING-DATE-CHANGE>20061220
<EFFECTIVENESS-DATE>20061220
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>IPG PHOTONICS CORP
<CIK>0001111928
<ASSIGNED-SIC>3674
<IRS-NUMBER>043444218
<STATE-OF-INCORPORATION>DE
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>S-8
<ACT>33
<FILE-NUMBER>333-139509
<FILM-NUMBER>061289098
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>50 OLD WEBSTER ROAD
<CITY>OXFORD
<STATE>MA
<ZIP>01540
<PHONE>5083731100
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>50 OLD WEBSTER ROAD
<CITY>OXFORD
<STATE>MA
<ZIP>01540
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>S-8
<SEQUENCE>1
<FILENAME>b63452ipsv8.htm
<DESCRIPTION>IPG PHOTONICS CORPORATION
<TEXT>
<HTML>
<HEAD>
<TITLE>sv8</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">As
filed with the Securities and Exchange Commission on December&nbsp;20, 2006
</DIV>


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt; margin-top: 6pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES<BR>
SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM S-8</B>
</DIV>


<DIV align="center" style="font-size: 12pt; margin-top: 3pt"><B>REGISTRATION STATEMENT<BR>
<i>UNDER<BR>
THE SECURITIES ACT OF 1933</i></B>
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>IPG PHOTONICS CORPORATION</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact Name of registrant as specified in its charter)</DIV>


<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="31%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Delaware</B><BR>
(State or other jurisdiction of <BR>
incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>3674</B><BR>
(Primary Standard Industrial<BR>
Classification Code Number)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>04-3444218</B><BR>
(I.R.S. Employer Identification Number)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>IPG Photonics Corporation Non-Employee Directors Stock Plan<BR>
IPG Photonics Corporation 2000 Incentive Compensation Plan<BR>
IPG Photonics Corporation 2006 Incentive Compensation Plan</B><BR>
(Full title of the plans)
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>50 Old Webster Road<BR>
Oxford, Massachusetts 01540<BR>
(508)&nbsp;373-1100</B><BR>
(Address, including zip code, and telephone number, including area code, of registrant&#146;s principal executive offices)
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Valentin P. Gapontsev, Ph.D.<BR>
Chief Executive Officer and Chairman of the Board<BR>
IPG Photonics Corporation<BR>
50 Old Webster Road<BR>
Oxford, Massachusetts 01540<BR>
(508)&nbsp;373-1100</B><BR>
(Name, address, including zip code, and telephone number, including area code, of agent for service)
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B><I>Copy To:</I></B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Robert W. Ericson, Esq.<BR>
David A. Sakowitz, Esq.<BR>
Winston &#038; Strawn LLP<BR>
200 Park Avenue<BR>
New York, New York 10166-4193<BR>
(212)&nbsp;294-6700</B>
</DIV>

<DIV align="center"><DIV style="font-size: 3pt; margin-top: 16pt; width: 25%; border-top: 1px solid #000000">&nbsp;</DIV></DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>CALCULATION OF REGISTRATION FEE</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="1%">&nbsp;</TD>
    <TD width="54%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD><!-- VRule -->
    <TD width="2%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>

    <TD width="1%">&nbsp;</TD>
</TR><TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="23" style="border-bottom: 3px double #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Proposed</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Proposed</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Maximum</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center">Title of Each Class of</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Amount</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Maximum</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Aggregate</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Amount of</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center">Securities To</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">To Be</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Offering Price</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Offering</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Registration</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">    <TD width="1%">&nbsp;</TD>

    <TD nowrap align="center" style="border-bottom: 0px solid #000000">Be Registered</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Registered (1)</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Per Share (2)</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Price (2)</TD>
    <TD>&nbsp;</TD>
    <TD style="border-right: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 0px solid #000000">Fee</TD>
    <TD>&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
                    <TD style="border-top: 1px solid #000000"><DIV style="margin-left:15px; text-indent:-15px">COMMON STOCK, $.0001 PAR VALUE PER SHARE, ISSUABLE PURSUANT TO:</DIV></TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000"><DIV style="margin-left:30px; text-indent:-15px">IPG Photonics Corporation Non-Employee Directors Stock Plan</DIV></TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="center" style="border-top: 1px solid #000000">166,667&nbsp;shares</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">4,050,000</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">433</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000"><DIV style="margin-left:30px; text-indent:-15px">IPG Photonics Corporation 2000 Incentive Compensation Plan</DIV></TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="center" style="border-top: 1px solid #000000">5,833,333&nbsp;shares</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>

<TD align="right" style="border-top: 1px solid #000000">141,750,000</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">15,167</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000"><DIV style="margin-left:30px; text-indent:-15px">IPG Photonics Corporation 2006 Incentive Compensation Plan</DIV></TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="center" style="border-top: 1px solid #000000">4,000,000&nbsp;shares</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">97,200,000</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">10,401</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000"><DIV style="margin-left:15px; text-indent:-15px"><B><I>TOTAL</I></B></DIV></TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD colspan="3" align="center" style="border-top: 1px solid #000000">10,000,000&nbsp;shares</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">24.30</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>

<TD align="right" style="border-top: 1px solid #000000">243,000,000</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-right: 1px solid #000000; border-top: 1px solid #000000">&nbsp;</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD align="left" style="border-top: 1px solid #000000">$</TD>
    <TD align="right" style="border-top: 1px solid #000000">26,001</TD>
    <TD style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD width="1%" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR style="font-size: 1px" valign="bottom">
    <TD nowrap align="left" colspan="23" style="border-top: 3px double #000000">&nbsp;</TD>
</TR>

<!-- End Table Body -->
</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" nowrap align="left">(1)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>In accordance with Rule 416(a) under the Securities Act of 1933, as
amended, this Registration Statement shall be deemed to cover any
additional shares of the Registrant&#146;s common stock that become
issuable under the IPG Photonics Corporation Non-Employee Directors
Stock Plan, the IPG Photonics Corporation 2000 Incentive Compensation
Plan or the IPG Photonics Corporation 2006 Incentive Compensation Plan
as a result of a stock split, stock dividend or similar adjustment of
the outstanding shares of common stock of IPG Photonics Corporation.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" nowrap align="left">(2)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Estimated solely for the purpose of determining the registration fee
and computed in accordance with Rule 457(c) and 457(h) of the
Securities Act of 1933, as amended. Such computation is based on the
average of the high and low prices as reported on The Nasdaq Global
Market on December&nbsp;18, 2006.</TD>
</TR>

</TABLE>
</DIV>

<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>







<P align="center" style="font-size: 10pt"><!-- Folio -->2<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<!-- TOC -->
<A name="toc"><DIV align="CENTER" style="page-break-before:always"><U><B>TABLE OF CONTENTS</B></U></DIV></A>

<P><CENTER>
<TABLE border="0" width="90%" cellpadding="0" cellspacing="0">
<TR>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="3%"></TD>
	<TD width="76%"></TD>
</TR>
<TR><TD colspan="9"><A HREF="#000">PART I</A></TD></TR>
<TR><TD colspan="9"><A HREF="#001">INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</A></TD></TR>
<TR><TD colspan="9"><A HREF="#002">PART II</A></TD></TR>
<TR><TD colspan="9"><A HREF="#003">INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#004">Item&nbsp;3.&nbsp;&nbsp;&nbsp; Incorporation of Documents by Reference.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#005">Item&nbsp;4.&nbsp;&nbsp;&nbsp; Description of Securities.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#006">Item&nbsp;5.&nbsp;&nbsp;&nbsp; Interests of Named Experts and Counsel.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#007">Item&nbsp;6.&nbsp;&nbsp;&nbsp; Indemnification of Directors and Officers.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#008">Item&nbsp;7.&nbsp;&nbsp;&nbsp; Exemption from Registration Claimed.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#009">Item&nbsp;8.&nbsp;&nbsp;&nbsp; Exhibits.</A></TD></TR>
<TR><TD></TD><TD colspan="8"><A HREF="#010">Item&nbsp;9.&nbsp;&nbsp;&nbsp; Undertakings.</A></TD></TR>
<TR><TD colspan="9"><A HREF="#011">SIGNATURES</A></TD></TR>
<TR><TD colspan="9"><A HREF="#012">POWER OF ATTORNEY</A></TD></TR>
<TR><TD colspan="9"><A HREF="#013">EXHIBIT INDEX</A></TD></TR>
<TR><TD colspan="9"><A HREF="b63452ipexv5w1.htm">EX-5.1 OPINION OF WINSTON & STRAWN LLP</A></TD></TR>
<TR><TD colspan="9"><A HREF="b63452ipexv23w1.htm">EX-23.1 CONSENT OF DELOITTE & TOUCHE LLP</A></TD></TR>
</TABLE>
</CENTER>
<!-- /TOC -->
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<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>




<!-- link1 "PART I" -->
<DIV align="left"><A NAME="000"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART I</B>
</DIV>

<!-- link1 "INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS" -->
<DIV align="left"><A NAME="001"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INFORMATION REQUIRED IN THE SECTION 10(a) PROSPECTUS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;IPG Photonics Corporation, a Delaware corporation (the &#147;Registrant&#148;), shall deliver the
document containing the information in Part&nbsp;I of this Registration Statement on Form S-8 to each
participant in the IPG Photonics Corporation Non-Employee Directors Stock Plan, the IPG Photonics
Corporation 2000 Incentive Compensation Plan and the IPG Photonics Corporation 2006 Incentive
Compensation Plan as specified by Rule&nbsp;428(b)(1) of the Securities Act of 1933, as amended (the
&#147;1933 Act&#148;). Such document is not being filed with or included in this Registration Statement (by
incorporation by reference or otherwise) in accordance with the rules and regulations of the
Securities and Exchange Commission (the &#147;Commission&#148;). Such document and the documents
incorporated by reference into this Registration Statement pursuant to Item&nbsp;3 of Part&nbsp;II of this
Registration Statement, taken together, constitute a prospectus that meets the requirements of
Section 10(a) of the 1933 Act.
</DIV>
<!-- link1 "PART II" -->
<DIV align="left"><A NAME="002"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>PART II</B>
</DIV>

<!-- link1 "INFORMATION REQUIRED IN THE REGISTRATION STATEMENT" -->
<DIV align="left"><A NAME="003"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INFORMATION REQUIRED IN THE REGISTRATION STATEMENT</B>
</DIV>

<!-- link2 "Item&nbsp;3.&nbsp;&nbsp;&nbsp; Incorporation of Documents by Reference." -->
<DIV align="left"><A NAME="004"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;3.&nbsp;&nbsp;&nbsp; Incorporation of Documents by Reference.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents filed by the Registrant with the Commission are incorporated by
reference in this Registration Statement:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a) the Registrant&#146;s Prospectus filed pursuant to Rule 424(b) under the 1933 Act
relating to the Registrant&#146;s Registration Statement on Form S-1, as amended (Registration
No.&nbsp;333-136521); and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(b) the description of the Registrant&#146;s common stock, par value $0.0001 per share,
contained in its Registration Statement on Form&nbsp;8-A/A, filed on
December&nbsp;7, 2006 pursuant to
Section 12(b) of the Securities Exchange Act of 1934, as amended (the &#147;1934 Act&#148;), including
any amendment or report filed for the purpose of updating such description.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All documents subsequently filed with the Commission by the Registrant pursuant to Sections
13(a), 13(c), 14 or 15(d) of the 1934 Act prior to the filing of a post-effective amendment, which
indicates that all securities offered herein have been sold or which deregisters all securities
then remaining unsold, shall be deemed to be incorporated by reference herein and to be part hereof
from the respective dates of filing of such documents. Any statement contained herein or in a
document incorporated or deemed to be incorporated by reference herein shall be deemed to be
modified or superseded for purposes hereof or for purposes of the related prospectus to the extent
that a statement contained herein or in any other subsequently filed document which is also
incorporated or deemed to be incorporated herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed, except as so modified or superseded, to
constitute a part of this Registration Statement.
</DIV>
<!-- link2 "Item&nbsp;4.&nbsp;&nbsp;&nbsp; Description of Securities." -->
<DIV align="left"><A NAME="005"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4.&nbsp;&nbsp;&nbsp; Description of Securities.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable.
</DIV>
<!-- link2 "Item&nbsp;5.&nbsp;&nbsp;&nbsp; Interests of Named Experts and Counsel." -->
<DIV align="left"><A NAME="006"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;5.&nbsp;&nbsp;&nbsp; Interests of Named Experts and Counsel.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;None.
</DIV>
<!-- link2 "Item&nbsp;6.&nbsp;&nbsp;&nbsp; Indemnification of Directors and Officers." -->
<DIV align="left"><A NAME="007"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6.&nbsp;&nbsp;&nbsp; Indemnification of Directors and Officers.</B>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->3<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant is incorporated under the laws of the State of Delaware. Section&nbsp;145 of the
Delaware General Corporation Law provides that a corporation may indemnify any persons who were,
are or are threatened to be made, parties to any threatened, pending or completed action, suit or
proceeding, whether civil, criminal, administrative or investigative (other than an action by or in
the right of such corporation), by reason of the fact that such person is or was an officer,
director, employee or agent of such corporation, or is or was serving at the request of such
corporation as a director, officer, employee or agent of another corporation, partnership, joint
venture, trust or other enterprise. The indemnity may include expenses (including attorneys&#146;
fees), judgments, fines and amounts paid in settlement actually and reasonably incurred by such
person in connection with such action, suit or proceeding, provided such person acted in good faith
and in a manner he or she reasonably believed to be in or not opposed to the corporation&#146;s best
interests and, with respect to any criminal action or proceeding, had no reasonable cause to
believe that his or her conduct was unlawful.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;145 of the Delaware General Corporation Law further authorizes a corporation to
purchase and maintain insurance on behalf of any person who is or was a director, officer, employee
or agent of the corporation, or is or was serving at the request of the corporation as a director,
officer, employee or agent of another corporation or enterprise, against any liability asserted
against him or her and incurred by him or her in any such capacity, arising out of his or her
status as such, whether or not the corporation would otherwise have the power to indemnify him or
her under Section&nbsp;145 of the Delaware General Corporation Law.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;102(b)(7) of the Delaware General Corporation Law permits a corporation to provide in
its certificate of incorporation a provision eliminating or limiting the personal liability of a
director to the corporation or its stockholders for monetary damages for breach of fiduciary duty
as a director, provided that such provision shall not eliminate or limit the liability of a
director: for any breach of the director&#146;s duty of loyalty to the corporation or its stockholders;
for acts or omissions not in good faith or which involve intentional misconduct or a knowing
violation of law; for payment of dividends or stock purchases or redemptions by the corporation in
violation of Section&nbsp;174 of the Delaware General Corporation Law; or for any transaction from which
the director derived an improper personal benefit.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s certificate of incorporation limits the personal liability of a director of
the Registrant for breach of fiduciary duty as a director to the maximum extent permitted by the
Delaware General Corporation Law. The Registrant&#146;s certificate of incorporation provides that no
director will have personal liability to the Registrant or to stockholders of the Registrant for
monetary damages for any such breach of fiduciary duty as a director. However, these provisions do
not eliminate or limit the liability of any of the directors or officers of the Registrant for:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any breach of the director&#146;s duty of loyalty to the Registrant or stockholders of the Registrant;</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any act or omission not in good faith or that involves intentional misconduct or a knowing violation of law;</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any unlawful payments related to dividends or unlawful stock repurchases, redemptions or other distributions; or</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="1%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>any transaction from which the director or officer derived an improper personal benefit.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These limitations of liability do not alter director liability under the federal securities
laws and do not affect the availability of equitable remedies such as an injunction or rescission.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant&#146;s certificate of incorporation and by-laws provide for indemnification of
directors and officers by the Registrant to the fullest extent permitted by Delaware law and
provide that the Registrant will advance expenses, including attorney&#146;s fees, to the directors and
officers of the Registrant in connection with legal proceedings, subject to very limited
exceptions.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In addition to the indemnification provisions of the Registrant&#146;s certificate of incorporation
and by-laws, the Registrant has entered into indemnification agreements with each of the directors
and executive officers of the Registrant. These agreements provide that the Registrant will
indemnify each of its directors and executive officers to the fullest extent permitted by law and
advance expenses to each indemnitee in connection with any proceeding in which indemnification is
available.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant also maintains general liability insurance which covers certain liabilities of
the directors and officers of the Registrant arising out of claims based on acts or omissions in
their capacities as directors and officers, including
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->4<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">liabilities under the 1933 Act. Insofar as
indemnification for liabilities arising under the 1933 Act may be permitted to
directors, officers or persons controlling the Registrant pursuant to the foregoing
provisions, the Registrant has been informed that in the opinion of the Commission such
indemnification is against public policy as expressed in the 1933 Act and is therefore
unenforceable.
</DIV>
<!-- link2 "Item&nbsp;7.&nbsp;&nbsp;&nbsp; Exemption from Registration Claimed." -->
<DIV align="left"><A NAME="008"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;7.&nbsp;&nbsp;&nbsp; Exemption from Registration Claimed.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Not Applicable.
</DIV>
<!-- link2 "Item&nbsp;8.&nbsp;&nbsp;&nbsp; Exhibits." -->
<DIV align="left"><A NAME="009"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;8.&nbsp;&nbsp;&nbsp; Exhibits.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following documents are filed as exhibits to this Registration Statement:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="10%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">
    <TD nowrap align="left"><B> Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="LEFT" style="border-bottom: 1px solid #000000"><B>Description of Document</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated Certificate of Incorporation (incorporated by
reference to Exhibit&nbsp;3.2 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated By-laws (incorporated by reference to Exhibit&nbsp;3.4 to
the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Specimen Stock Certificate (incorporated by reference to Exhibit&nbsp;4.1 to
the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.4
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">IPG Photonics Corporation 2000 Incentive Compensation Plan (incorporated
by reference to Exhibit&nbsp;10.1 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.5
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">IPG Photonics Corporation 2006 Incentive Compensation Plan (incorporated
by reference to Exhibit&nbsp;10.2 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.6
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">IPG Photonics Corporation Non-Employee Directors Stock Plan (incorporated
by reference to Exhibit&nbsp;10.4 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Winston &#038; Strawn LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Deloitte &#038; Touche LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Winston &#038; Strawn LLP (included in opinion filed as Exhibit&nbsp;5.1).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Powers of Attorney (included on signature page).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<!-- link2 "Item&nbsp;9.&nbsp;&nbsp;&nbsp; Undertakings." -->
<DIV align="left"><A NAME="010"></A></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;9.&nbsp;&nbsp;&nbsp; Undertakings.</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(a)&nbsp;The undersigned Registrant hereby undertakes:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;To file, during any period in which offers or sales are being made, a post-effective
amendment to this Registration Statement:
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
(i)&nbsp;To include any prospectus required by Section&nbsp;10(a)(3) of the 1933 Act;
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) To reflect in the prospectus any facts or events arising after the effective date
of the Registration Statement (or the most recent post-effective amendment thereof) which,
individually or in the aggregate, represent a fundamental change in the information set
forth in the Registration Statement. Notwithstanding the foregoing, any increase or decrease
in volume of securities offered (if the total dollar value of securities offered would not
exceed
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->5<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">that which was registered) and any deviation from the low or high end of the
estimated maximum offering range may be reflected in the form of prospectus filed with the
Commission pursuant to Rule 424(b) if, in the aggregate, the
changes in volume and price represent no more than a 20% change in the maximum
aggregate offering price set forth in the &#147;Calculation of Registration Fee&#148; table in the
effective Registration Statement; and
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 4%">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) To include any material information with respect to the plan of distribution not
previously disclosed in the Registration Statement or any material change to such
information in the Registration Statement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Provided</I>, <I>however</I>, that paragraphs (a)(1)(i) and (a)(1)(ii) do not apply if the information
required to be included in a post-effective amendment by those paragraphs is contained in reports
filed with or furnished to the Commission by the Registrant pursuant to Section&nbsp;13 or Section 15(d)
of the 1934 Act.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;That, for the purpose of determining any liability under the 1933 Act, each
post-effective amendment shall be deemed to be a new registration statement relating to the
securities offered therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;To remove from registration by means of a post-effective amendment any of the securities
being registered which remain unsold at the termination of this offering.
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(b)&nbsp;The Registrant hereby undertakes that, for purpose of determining any liability under the 1933
Act, each filing of the Registrant&#146;s annual report pursuant to Section 13(a) or Section 15(d) of
the Exchange Act that is incorporated by reference in the Registration Statement shall be deemed to
be a new registration statement relating to the securities offered therein, and the offering of
such securities at that time shall be deemed to be the initial bona fide offering thereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">(c)&nbsp;Insofar as indemnification for liabilities arising under the 1933 Act may be permitted to
directors, officers and controlling persons of the Registrant pursuant to the foregoing provisions,
or otherwise, the Registrant has been advised that in the opinion of the Commission such
indemnification is against public policy as expressed in the 1933 Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such liabilities (other than
the payment by the Registrant of expenses incurred or paid by a director, officer or controlling
person of the Registrant in the successful defense of any such action, suit or proceeding) is
asserted by such director, officer or controlling person in connection with the securities being
registered, the Registrant will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the question whether such
indemnification by it is against public policy as expressed in the 1933 Act and will be governed by
the final adjudication of such issue.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->6<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<!-- link1 "SIGNATURES" -->
<DIV align="left"><A NAME="011"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it
has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and
has duly caused this Registration Statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in Oxford, Massachusetts, on December&nbsp;18, 2006.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left"><B>IPG PHOTONICS CORPORATION</B><BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Valentin P. Gapontsev
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top">Name:&nbsp;&nbsp;</TD>
    <TD align="left">Valentin P. Gapontsev&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top">Title:&nbsp;&nbsp;</TD>
    <TD align="left">Chief Executive Officer and Chairman of the Board&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>
<!-- link1 "POWER OF ATTORNEY" -->
<DIV align="left"><A NAME="012"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>POWER OF ATTORNEY</B>
</DIV>



<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>KNOW ALL MEN BY THESE PRESENTS</B>, that each person whose signature appears below constitutes and
appoints Valentin P. Gapontsev as such person&#146;s true and lawful attorney-in-fact and agent, with
full power of substitution and revocation, for such person and in such person&#146;s name, place and
stead, in any and all capacities to sign any and all amendments (including post-effective
amendments) to this Registration Statement, and to file the same with all exhibits thereto, and the
other documents in connection therewith, and any registration statement relating to any offering
made pursuant to this Registration Statement that is to be effective upon filing pursuant to Rule
462(b) under the 1933 Act with the Securities and Exchange Commission, granting unto said
attorney-in-fact and agent full power and authority to do and perform each and every act and things
requisite and necessary to be done, as fully to all intents and purposes as such person might or
could do in person, hereby ratifying and confirming all that said attorney-in-fact and agent, or
his substitute, may lawfully do or cause to be done by virtue hereof.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the 1933 Act, the registrant has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Oxford,
Massachusetts, on December&nbsp;18, 2006.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="25%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Signature</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Title</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Date</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Valentin P. Gapontsev
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Valentin P. Gapontsev
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Executive Officer,<BR>
Chairman of the Board and Director<BR>
(Principal Executive Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Timothy P.V. Mammen
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Timothy P.V. Mammen
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Chief Financial Officer<BR>
(Principal Financial Officer and<BR>
Principal Accounting Officer)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Robert A. Blair
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Robert A. Blair
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Michael C. Child
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Michael C. Child
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ John H. Dalton
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
John H. Dalton
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Henry E. Gauthier
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Henry E. Gauthier
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ William S. Hurley
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
William S. Hurley
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->7<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">

<TR valign="bottom">
    <TD width="30%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="25%">&nbsp;</TD>
</TR>
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ William F. Krupke
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
William F. Krupke
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Eugene Shcherbakov
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Eugene Shcherbakov
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><DIV style="margin-left:0px; text-indent:-0px">/s/ Igor Samartsev
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Igor Samartsev
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Director
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">December&nbsp;&nbsp;18,&nbsp;2006</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->8<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#toc">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<!-- link1 "EXHIBIT INDEX" -->
<DIV align="left"><A NAME="013"></A></DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>EXHIBIT INDEX</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="10%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">
    <TD nowrap align="left"><B> Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 10pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Description of Document</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated Certificate of Incorporation (incorporated by
reference to Exhibit&nbsp;3.2 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Amended and Restated By-laws (incorporated by reference to Exhibit&nbsp;3.4 to
the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.3
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Specimen Stock Certificate (incorporated by reference to Exhibit&nbsp;4.1 to
the Registrant&#146;s Registration Statement on Form&nbsp;S-1, file number
333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.4
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">IPG Photonics Corporation 2000 Incentive Compensation Plan (incorporated
by reference to Exhibit&nbsp;10.1 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.5
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">IPG Photonics Corporation 2006 Incentive Compensation Plan (incorporated
by reference to Exhibit&nbsp;10.2 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">4.6
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">IPG Photonics Corporation Non-Employee Directors Stock Plan (incorporated
by reference to Exhibit&nbsp;10.4 to the Registrant&#146;s Registration Statement on
Form&nbsp;S-1, file number 333-136521).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Opinion of Winston &#038; Strawn LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Deloitte &#038; Touche LLP.</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.2
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Winston &#038; Strawn LLP (included in opinion filed as Exhibit&nbsp;5.1).</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">24.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Powers of Attorney (included on signature page).</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<P align="center" style="font-size: 10pt"><!-- Folio -->9<!-- /Folio -->
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>b63452ipexv5w1.htm
<DESCRIPTION>EX-5.1 OPINION OF WINSTON & STRAWN LLP
<TEXT>
<HTML>
<HEAD>
<TITLE>exv5w1</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="right" style="font-size: 10pt; margin-top: 12pt">Exhibit&nbsp;5.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 36pt">&#091;LETTERHEAD
OF WINSTON &#038; STRAWN LLP&#093;
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 36pt">December&nbsp;20, 2006
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 18pt">IPG Photonics Corporation<BR>
50 Old Webster Road<BR>
Oxford, Massachusetts 01540

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Re:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <U>Registration Statement on Form&nbsp;S-8</U>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 18pt">Ladies and Gentlemen:
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have acted as counsel for IPG Photonics Corporation, a Delaware corporation (the
&#147;<U>Company</U>&#148;), in connection with the preparation and filing of the Company&#146;s registration
statement on Form S-8 (the &#147;<U>Registration Statement</U>&#148;) relating to the offer and sale of: (i)
up to 4,000,000 shares (the &#147;<U>2006 Plan Shares</U>&#148;) of the Company&#146;s common stock, par value
$0.0001 per share (&#147;<U>Common Stock</U>&#148;), issuable pursuant to the terms and in the manner set
forth in the IPG Photonics Corporation 2006 Incentive Compensation Plan (the &#147;<U>2006 Plan</U>&#148;);
(ii)&nbsp;up to 5,833,333 shares (the &#147;<U>2000 Plan Shares</U>&#148;) of Common Stock issuable pursuant to
the terms and in the manner set forth in the IPG Photonics Corporation 2000 Incentive Compensation
Plan (the &#147;<U>2000 Plan</U>&#148;); and (iii)&nbsp;up to 166,667 shares (together with the 2006 Plan Shares
and the 2000 Plan Shares, the &#147;<U>Shares</U>&#148;) of Common Stock issuable pursuant to the terms and
in the manner set forth in the IPG Photonics Corporation Non-Employee Directors Stock Plan
(together with the IPG Photonics Corporation 2006 Incentive Compensation Plan and the IPG Photonics
Corporation 2000 Incentive Compensation Plan, the &#147;<U>Plans</U>&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This opinion letter is being furnished in accordance with the requirements of Item&nbsp;601(b)(5)
of Regulation&nbsp;S-K promulgated under the Securities Act of 1933, as amended (the &#147;<U>Securities
Act</U>&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In rendering the opinion set forth below, we have examined and relied upon such certificates,
corporate records, agreements, instruments and other documents that we considered necessary or
appropriate as a basis for the opinion, including (i)&nbsp;the Registration Statement, (ii)&nbsp;the Amended
and Restated Certificate of Incorporation of the Company, (iii)&nbsp;the Amended and Restated By-laws of
the Company and (iv)&nbsp;the Plans. In our examination, we have assumed the legal capacity of all
natural persons, the genuineness of all signatures, the authenticity of all documents submitted to
us as originals, the conformity to original documents of all documents
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">IPG Photonics Corporation<BR>
December&nbsp;20, 2006<BR>
Page 2

</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">submitted to us as certified or photostatic copies and the authenticity of the originals of
such latter documents. As to any facts material to this opinion that we did not independently
establish or verify, we have relied upon oral or written statements and representations of officers
and other representatives of the Company and others.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Based upon the foregoing and subject to the assumptions, qualifications and limitations set
forth herein, we are of the opinion that the Shares, when issued, sold and delivered pursuant to
the terms and in the manner set forth in the Plans, and assuming that the Shares have been and
remain duly reserved for issuance within the limits of the Common Stock then remaining authorized
but unissued, will be validly issued, fully paid and nonassessable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We do not express any opinion herein concerning any law other than the General Corporation Law
of the State of Delaware (including the statutory provisions, all applicable provisions of the
Delaware Constitution and reported judicial decisions interpreting the foregoing).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We hereby consent to the filing of this opinion letter as Exhibit&nbsp;5.1 to the Registration
Statement. In giving such consent, we do not concede that we are experts within the meaning of the
Securities Act or the rules and regulations thereunder or that this consent is required by Section
7 of the Securities Act.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
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    <TD width="48%">&nbsp;</TD>
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    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Very truly yours,<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>


<TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">/s/ Winston&nbsp;&#038;&nbsp;Strawn
LLP &nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
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<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>b63452ipexv23w1.htm
<DESCRIPTION>EX-23.1 CONSENT OF DELOITTE & TOUCHE LLP
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<DIV align="right" style="font-size: 10pt; margin-top: 12pt">Exhibit&nbsp;23.1
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">We consent to the incorporation by reference in this Registration Statement of IPG Photonics
Corporation on Form S-8 of our report dated November&nbsp;13, 2006 (December&nbsp;7, 2006 as to the third
paragraph of Note 1 and November&nbsp;22, 2006 as to the third paragraph of Note 11) (which report
expresses an unqualified opinion and includes an explanatory paragraph as to the adoption of
Statement of Financial Accounting Standards No.&nbsp;123(R), &#147;Share-Based Payment,&#148; effective January&nbsp;1,
2006), relating to the consolidated financial statements of IPG Photonics Corporation and
subsidiaries appearing in Amendment No. 6 to Registration Statement No.&nbsp;333-136521 of IPG Photonics
Corporation on Form S-1/A filed with the Securities and Exchange Commission.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt">/s/ Deloitte &#038; Touche LLP
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Boston, Massachusetts<BR>
December&nbsp;18, 2006

</DIV>


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