(19)

(11)

EP 2 606 541 A1

(12)

(43) Date of publication: 26.06.2013 Bulletin 2013/26 (21) Application number: 10856236.4 (22) Date of filing: 18.08.2010

(51) International Patent Classification (IPC):  H01S 5/02(2006.01) (86) International application number: PCT/US2010/045853 (87) International publication number: WO 2012/023932 (23.02.2012 Gazette 2012/08)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR (71) Applicant: IPG Photonics Corporation Oxford, Massachusetts 01540 (US)	(72) Inventors: GAPONTSEV, Valentin Oxford, MA 01540 (US) OVTCHINNIKOV, Alex Oxford, MA 01540 (US) STARODUBOV, Dmitry Oxford, MA 01540 (US) KOMISSAROV, Alexey Oxford, MA 01540 (US) (74) Representative: Kohlmann, Kai  Donatusstrasse 1 D-52078 Aachen D-52078 Aachen (DE)