Manipulating the heat load distribution by laser gain competition in TMI-limited fiber amplifiers

Friedrich Möller; Victor Distler; Thomas Schreiber; Ramona Eberhardt; Andreas Tünnermann

doi:10.1117/12.2545951

21 February 2020 Manipulating the heat load distribution by laser gain competition in TMI-limited fiber amplifiers

Friedrich Möller, Victor Distler, Thomas Schreiber, Ramona Eberhardt, Andreas Tünnermann

Proceedings Volume 11260, Fiber Lasers XVII: Technology and Systems; 1126019 (2020) https://doi.org/10.1117/12.2545951
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

Supported by both experimental and simulated results, this contribution demonstrates the heat load distribution in a co-pumped, ytterbium (Yb)-doped fiber amplifier seeded with two different wavelengths can be significantly changed depending on the seed power ratio. Longitudinal temperature measurements in a Yb-doped 10.5 m 20/400 μm fiber confirm a significant shift of the heat load maximum by 3.5 m towards the fiber output when decreasing the seed power ratio from P_1030nm/P_1080nm = 1.7 to 20. In single-tone operation with a seed power of P_1080nm = 3.5 W, the amplifier is limited by the onset of transverse mode instabilities at a power-level of 1950 W. However, dual-tone seeding with a seed power ratio up to P_1030nm/P_1080nm = 10 reduces the TMI-threshold dramatically down to 1050 W. Additionally we show, that the modal instability threshold is very susceptible to 1030 nm seed noise in the frequency regime up to 10 kHz.

Conference Presentation

Citation Download Citation

Friedrich Möller, Victor Distler, Thomas Schreiber, Ramona Eberhardt, and Andreas Tünnermann "Manipulating the heat load distribution by laser gain competition in TMI-limited fiber amplifiers", Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126019 (21 February 2020); https://doi.org/10.1117/12.2545951

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