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