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  4. Real-time modal decomposition of fiber laser beams using a spatial mode multiplexer
 
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2022
Conference Paper
Titel

Real-time modal decomposition of fiber laser beams using a spatial mode multiplexer

Abstract
Modal decomposition (MD) techniques are a way to characterize the modal amplitudes and phases of eigenmodes in optical fibers. Some applications such as, e.g., diagnosing/analyzing transverse mode instabilities or monitoring a laser beam during operation, require a high-speed modal decomposition. However, the proposed modal decomposition techniques up to now are seldom able to implement a real-time MD due to their complex post-processing (e.g., most of the numerical computing-based MD). In this work a high-speed, real-time modal decomposition of fiber laser beams is presented. It employs a spatial mode multiplexer (MUX), which is a multipass cavity with multiple single-mode fiber (SMF) inputs and a single few-mode fiber (FMF) output, operated in reverse. Thus, if the output of a fiber laser system is imaged on the end facet of the FMF, then the MUX is used as a demultiplexer and, thus, the modal amplitude information can be obtained by reading out the different SMF input ports. We have carried out several experiments with the MUX and it has been proven that this method is accurate and extremely fast. In fact, it is even able to decompose the beam during a Q-switched pulse emission and produce real-time results.
Author(s)
Tu, Yiming
Friedrich-Schiller-Universität Jena
Jauregui, Cesar
Friedrich-Schiller-Universität Jena
Kholaif, Sobhy E.
Friedrich-Schiller-Universität Jena
Limpert, Jens
Friedrich-Schiller-Universität Jena
Hauptwerk
Fiber Lasers XIX: Technology and Systems
Project(s)
Kontrolle von transversale Modenwechselwirkung in hoch-Leistung Faserlasersysteme
Studie und Kontrolle von intermodalen Energietransfer in hoch-Leistung Faserlasersysteme
Funder
Deutsche Forschungsgemeinschaft -DFG-, Bonn
Deutsche Forschungsgemeinschaft -DFG-, Bonn
Konferenz
Conference "Fiber Lasers - Technology and Systems" 2022
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DOI
10.1117/12.2609322
Language
English
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Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF
Tags
  • fiber laser

  • real-time modal decom...

  • spatial mode multiple...

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