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Opt Lett. 2011 Dec 1;36(23):4572-4. doi: 10.1364/OL.36.004572.

High-speed modal decomposition of mode instabilities in high-power fiber lasers.

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  • 1Friedrich Schiller Universität Jena, Institute of Applied Physics, Albert-Einstein-Str. 15, 07745 Jena, Germany. fabian.stutzki@uni‑jena.de

Abstract

A high-speed mode analysis technique is required to gain fundamental understanding of mode instabilities in high-power fiber laser systems. In this work a technique, purely based on the intensity profile of the beam, is demonstrated to be ideally suited to analyze fiber laser dynamics. This technique, together with a high-speed camera, has been applied to the study of the temporal dynamics of mode instabilities at high average powers with up to 20,000 frames per second. These measurements confirm that energy transfer between the fluctuating transversal modes takes place in millisecond-time-scale.

© 2011 Optical Society of America

PMID:
22139246
[PubMed]
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