Device for wavelength combining of laser beams

US9690107B2 · kind B2 · utility

Assignee

• TRUMPF LASER GMBH · DE

Inventors

• Viorel C. Negoita · Plainsboro, US
• Thilo Vethake · Cranbury, US
• Alexander Killi · Trossingen, DE
• Christoph Tillkorn · Villingendorf, DE
• Stephan Strohmaier · Berlin, DE
• Steffen Ried · Herrenberg, DE
• Yufeng Li · Morrisville, US
• Haiyan An · Plainsboro, US
• Tobias Barnowski · Cranbury, US

Key dates

• Filing date: Mar 15, 2013
• Grant date: Jun 27, 2017
• Expiry date: Jan 9, 2036

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S5/005
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A device for wavelength coupling of laser beams (2a, . . . 2n) with different wavelengths (λ1, . . . λn), comprising: at least one laser source for generating a plurality of laser beams (2a, . . . , 2n), and an overlapping device for spatial overlapping of the plurality of laser beams (2a, . . . , 2n) for forming an overlapped laser beam with a plurality of wavelengths (λ1 . . . λn). The device has a feedback device arranged between the laser source and the overlapping device for feeding a radiation proportion of the laser beams (2a, . . . , 2n) to be overlapped back to the laser source, the feedback device comprising a partially reflecting angle-dispersive optical element, in particular a partially reflecting diffraction grating. The overlapping device may, for example, be configured as a transmitting or reflecting diffraction grating whose optical properties are adapted to the optical properties of the partially reflecting diffraction grating to overlap the laser beams (2a, . . . , 2n) in an essentially dispersion-free manner.