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Proceedings Paper

Novel high-speed camera analysis of transverse mode instabilities in rod fiber amplifiers
Author(s): Simon L. Christensen; Mette M. Johansen; Mattia Michieletto; Marco Triches; Laurent Hout; Martin D. Maack; Jesper Lægsgaard
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Paper 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.

Paper Details

Date Published: 21 February 2020
PDF: 8 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126017 (21 February 2020); doi: 10.1117/12.2542673
Show Author Affiliations
Simon L. Christensen, Technical Univ. of Denmark (Denmark)
NKT Photonics A/S (Denmark)
Mette M. Johansen, NKT Photonics A/S (Denmark)
Mattia Michieletto, NKT Photonics A/S (Denmark)
Marco Triches, NKT Photonics A/S (Denmark)
Laurent Hout, NKT Photonics A/S (Denmark)
Martin D. Maack, NKT Photonics A/S (Denmark)
Jesper Lægsgaard, Technical Univ. of Denmark (Denmark)

Published in SPIE Proceedings Vol. 11260:
Fiber Lasers XVII: Technology and Systems
Liang Dong, Editor(s)

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