Experimental investigation of transverse mode instabilities in a double-pass Yb-doped rod-type fiber amplifier

Christoph Stihler; Hans-Jürgen Otto; Cesar Jauregui; Jens Limpert; Andreas Tünnermann

doi:10.1117/12.2252715

22 February 2017 Experimental investigation of transverse mode instabilities in a double-pass Yb-doped rod-type fiber amplifier

Christoph Stihler, Hans-Jürgen Otto, Cesar Jauregui, Jens Limpert, Andreas Tünnermann

Author Affiliations +

Proceedings Volume 10083, Fiber Lasers XIV: Technology and Systems; 100830R (2017) https://doi.org/10.1117/12.2252715
Event: SPIE LASE, 2017, San Francisco, California, United States

Abstract

The phenomenon of transverse mode instabilities (TMI) is currently the most limiting effect for the scaling of the average output power of fiber laser systems with nearly diffraction-limited beam quality. Even though a significant amount of knowledge on TMI in single-pass fiber amplifiers has been generated in the last years, relatively little is known about this effect in multi-pass amplifiers and oscillators. In this contribution TMI is experimentally investigated in a double-pass fiber amplifier, for the first time to the best of our knowledge. The TMI threshold was found to be significantly lower in the double-pass configuration than in the single-pass arrangement. Furthermore, the investigations unveiled a complex dynamic behavior of the instabilities in the double-pass fiber amplifier.

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Christoph Stihler, Hans-Jürgen Otto, Cesar Jauregui, Jens Limpert, and Andreas Tünnermann "Experimental investigation of transverse mode instabilities in a double-pass Yb-doped rod-type fiber amplifier", Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100830R (22 February 2017); https://doi.org/10.1117/12.2252715

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