Stability investigations in active and passive high power fiber systems

Till Walbaum; Friedrich Möller; Victor Distler; Marco Plötner; Maximilian Strecker; Thomas Schreiber; Andreas Tünnermann

doi:10.1117/12.2604134

12 September 2021 Stability investigations in active and passive high power fiber systems

Till Walbaum, Friedrich Möller, Victor Distler, Marco Plötner, Maximilian Strecker, Thomas Schreiber, Andreas Tünnermann

Author Affiliations +

Proceedings Volume 11867, Technologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V; 118670I (2021) https://doi.org/10.1117/12.2604134
Event: SPIE Security + Defence, 2021, Online Only

Abstract

Fiber-based high-power laser systems are advantageous for defense applications due to their intrinsic stability and resilience against challenging environmental conditions. Using single- or few-mode output fibers, an excellent beam quality can be achieved, allowing for tight focusing over long distance. However, thermally induced transverse mode instabilities (TMI) limit the obtainable diffraction-limited output power. We will show how thermally induced mode instabilities can be conveniently detected in-line in an all-fiber system. Towards this aim, we compare different detection locations and methods and show that characteristic signals can be detected in backwards direction. Expanding the system and applying these detection methods, we will investigate Raman-based high-power amplification for spectral shift in a passive fiber. We present the observation and identification of TMI due to Raman amplification and the tracing of their origin, locating it in the passive fiber section. By comparing different fiber and seed laser parameters, we deduce respective limiting parameters.

Conference Presentation

Citation Download Citation

Till Walbaum, Friedrich Möller, Victor Distler, Marco Plötner, Maximilian Strecker, Thomas Schreiber, and Andreas Tünnermann "Stability investigations in active and passive high power fiber systems", Proc. SPIE 11867, Technologies for Optical Countermeasures XVIII and High-Power Lasers: Technology and Systems, Platforms, Effects V, 118670I (12 September 2021); https://doi.org/10.1117/12.2604134

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