Novel high-speed camera analysis of transverse mode instabilities in rod fiber amplifiers

Simon L. Christensen; Mette M. Johansen; Mattia Michieletto; Marco Triches; Laurent Hout; Martin D. Maack; Jesper Lægsgaard

doi:10.1117/12.2542673

21 February 2020 Novel high-speed camera analysis of transverse mode instabilities in rod fiber amplifiers

Simon L. Christensen, Mette M. Johansen, Mattia Michieletto, Marco Triches, Laurent Hout, Martin D. Maack, Jesper Lægsgaard

Author Affiliations +

Proceedings Volume 11260, Fiber Lasers XVII: Technology and Systems; 1126017 (2020) https://doi.org/10.1117/12.2542673
Event: SPIE LASE, 2020, San Francisco, California, United States

Abstract

In this work a novel accurate method of measuring beam fluctuations is presented and applied to analyze transverse mode instabilities (TMI). The new measurement, ST-measurement, uses Fourier analysis on data from a high-speed camera to achieve raw spatial information about beam fluctuations. TMI in a 65 μm mode- field-diameter aeroGain-ROD-PM85 fiber is investigated using both the ST- and standard photo detector measurement. A comparison of the two measurements shows the quantitative and qualitative superiority of the new ST-measurement due to the spatial information. Numerical simulations are carried out to support the interpretation of the data.

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Citation Download Citation

Simon L. Christensen, Mette M. Johansen, Mattia Michieletto, Marco Triches, Laurent Hout, Martin D. Maack, and Jesper Lægsgaard "Novel high-speed camera analysis of transverse mode instabilities in rod fiber amplifiers", Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126017 (21 February 2020); https://doi.org/10.1117/12.2542673

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