0001140361-08-014768 S-8 3 20080610 20080610 20080610 IPG PHOTONICS CORP 0001111928 3674 043444218 DE S-8 33 333-151571 08891573 50 OLD WEBSTER ROAD OXFORD MA 01540 5083731100 50 OLD WEBSTER ROAD OXFORD MA 01540 S-8 1 forms8.htm IPG PHOTONICS S-8 6-10-2008 EX-5.1 2 ex5_1.htm EXHIBIT 5.1 EX-23.1 3 ex23_1.htm EXHIBIT 23.1