Exhibit 21.1

Subsidiaries of Registrant

	State or Jurisdiction of	Ownership by Registrant as of
Name	Incorporation	December 31, 2010
IPG Laser GmbH	Germany		100	%
IPG Photonics (UK) Ltd.	United Kingdom		100	%
NTO IRE-Polus	Russia		87.5	%
IPG Photonics (Italy) S.r.l.	Italy		100	%
IPG Photonics (Japan) Ltd.	Japan		100	%
IPG Photonics (India) Pvt. Ltd.	India		100	%
IPG Photonics (Korea) Ltd.	South Korea		90	%
IPG Photonics (China) Ltd.	Hong Kong		100	%
IPG Investment Corp.	Delaware, U.S.A.		100	%
IPG Fiber Laser Technology Co. (Beijing) Ltd.	China		100	%
Photonics Innovations, Inc.	Alabama, U.S.A.		100	%