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Coherent combining of high brightness tapered amplifiers for efficient non-linear conversion

Abstract : We report on coherent beam combining of three high brightness tapered amplifiers seeded by a single-frequency laser at λ = 976 nm in a simple architecture with efficiently-cooled emitters. The maximal combined power of 12.9 W is achieved at a combining efficiency of > 65 % limited by the intrinsic beam quality of the amplifiers. The coherent combining cleans up the spatial profile, as the power content in the central lobe increases up to 86 %. This high-brightness infrared beam is converted into the visible by second harmonic generation, and results in a high non-linear conversion efficiency of 4.5 %/W and a maximum power over 2 W at 488 nm, limited by thermal effects in the PPLN.
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https://hal.archives-ouvertes.fr/hal-02332528
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Submitted on : Thursday, October 24, 2019 - 7:34:34 PM
Last modification on : Saturday, October 10, 2020 - 2:14:02 PM
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P. Albrodt, M. Jamal, A. Hansen, O. Jensen, G. Blume, et al.. Coherent combining of high brightness tapered amplifiers for efficient non-linear conversion. Optics Express, Optical Society of America - OSA Publishing, 2019, 27 (2), pp.928. ⟨10.1364/OE.27.000928⟩. ⟨hal-02332528⟩

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