22 February 2017 Experimental investigation of transverse mode instabilities in a double-pass Yb-doped rod-type fiber amplifier
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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, Christoph Stihler, Hans-Jürgen Otto, Hans-Jürgen Otto, Cesar Jauregui, Cesar Jauregui, Jens Limpert, Jens Limpert, Andreas Tünnermann, 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); doi: 10.1117/12.2252715; https://doi.org/10.1117/12.2252715
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