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

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

*Corresponding author for this work

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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.
Original languageEnglish
Title of host publicationProceedings of SPIE
Number of pages9
Volume11260
PublisherSPIE - International Society for Optical Engineering
Publication date2020
Article number1126017
DOIs
Publication statusPublished - 2020
EventSPIE Photonics West LASE 2020
- The Moscone Center, San Francisco, United States
Duration: 1 Feb 20206 Feb 2020

Conference

ConferenceSPIE Photonics West LASE 2020
LocationThe Moscone Center
CountryUnited States
CitySan Francisco
Period01/02/202006/02/2020
SeriesProceedings of SPIE, the International Society for Optical Engineering
Volume11260
ISSN0277-786X

Keywords

  • Transverse mode instability
  • Beam fluctuation measurement
  • High power
  • Thermal Rayleigh scattering
  • High-speed camera
  • Large-mode-area fiber

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