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

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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


ConferenceSPIE Photonics West LASE 2020
LocationThe Moscone Center
CountryUnited States
CitySan Francisco
SeriesProceedings of SPIE, the International Society for Optical Engineering


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

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