Title

Spectral Beam Combining Of Thulium Fiber Laser Systems

Keywords

Fiber lasers; Spectral beam combining; Thulium

Abstract

Beams from three frequency stabilized master oscillator power amplifier (MOPA) thulium fiber laser systems were spectrally beam combined using a metal diffraction grating. Two of the laser oscillators were stabilized with guided mode resonances filters while the third was stabilized using a gold-coated diffraction grating. Each system was capable of producing a minimum of 40 W output powers with slope efficiencies between 50-60 %. The three lasers undergoing combination were operating at wavelengths of 1984.3, 2002.1, and 2011.9 nm with spectral linewidths between 250-400 pm. Beam combining was accomplished by spatially overlapping the spectrally separated beams on a water-cooled gold-coated diffraction grating with 600 lines/mm. Beam quality measurements were completed using M2 measurements at multiple power levels of the combined beam. Power levels of 49 W were achieved before thermal heating of the metal diffraction grating cause degradation in beam quality. The combining grating was ~66% efficient for the unpolarized light corresponding to a total optical-to-optical efficiency of 33% with respect to launched pump power. © 2010 Copyright SPIE - The International Society for Optical Engineering.

Publication Date

5-10-2010

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

7580

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.842500

Socpus ID

77951862079 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77951862079

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