Highly efficient dual-grating 3-channel spectral beam combining of narrow-linewidth monolithic cw Yb-doped fiber amplifiers up to 5.5 kW

Maximilian Strecker; Marco Plötner; Fabian Stutzki; Till Walbaum; Sascha Ehrhardt; Tino Benkenstein; Uwe Zeitner; Thomas Schreiber; Ramona Eberhardt; Andreas Tünnermann; Uwe Stuhr; Markus Jung; Klaus Ludewigt

doi:10.1117/12.2508674

7 March 2019 Highly efficient dual-grating 3-channel spectral beam combining of narrow-linewidth monolithic cw Yb-doped fiber amplifiers up to 5.5 kW

Maximilian Strecker, Marco Plötner, Fabian Stutzki, Till Walbaum, Sascha Ehrhardt, Tino Benkenstein, Uwe Zeitner, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann, Uwe Stuhr, Markus Jung, Klaus Ludewigt

Author Affiliations +

Proceedings Volume 10897, Fiber Lasers XVI: Technology and Systems; 108970E (2019) https://doi.org/10.1117/12.2508674
Event: SPIE LASE, 2019, San Francisco, California, United States

Abstract

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 M² = 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 polarizationindependent 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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Maximilian Strecker, Marco Plötner, Fabian Stutzki, Till Walbaum, Sascha Ehrhardt, Tino Benkenstein, Uwe Zeitner, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann, Uwe Stuhr, Markus Jung, and Klaus Ludewigt "Highly efficient dual-grating 3-channel spectral beam combining of narrow-linewidth monolithic cw Yb-doped fiber amplifiers up to 5.5 kW", Proc. SPIE 10897, Fiber Lasers XVI: Technology and Systems, 108970E (7 March 2019); https://doi.org/10.1117/12.2508674

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