Journal
FIBER LASERS XVI: TECHNOLOGY AND SYSTEMS
Volume 10897, Issue -, Pages -Publisher
SPIE-INT SOC OPTICAL ENGINEERING
DOI: 10.1117/12.2508674
Keywords
Spectral beam combining (SBC); dual-grating setup; fiber amplifier; monolithic; dielectric reflection grating
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We present highly efficient three-channel dual-grating spectral beam combining with a combined signal output power of 5.5 kW at an excellent beam quality of M-2 = 1.5. Three 2-kW all-fiber narrow-linewidth continuous-wave Ytterbium doped fiber amplifiers at 1050 nm, 1070 nm and 1090 nm were combined using in-house fabricated polarization independent dielectric reflection gratings. The total combining efficiency was 94% at full power level, which is close to the expected value referred to the incorporated grating's efficiency in a dual-grating setup.
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