Mechanisms of beam clean up at Raman conversion of multimode radiation in graded-index fibers

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Abstract

As shown recently, highly multimode (M2∼30) radiation of laser diodes may be converted in graded-index fibers into high-quality (M2≤2) Raman beam at Stokes-shifted wavelength. Here we experimentally study output beam profiles for the transmitted pump and generated Stokes beams and develop an analytical balance model enabling theoretical beam profiles both near the Raman threshold and well above the threshold where significant depletion of the pump beam occurs due to the Raman conversion. Comparison of the theory and experiment allows for the identification of main mechanisms of the Raman beam clean up in this system, including linear and nonlinear effects.

Original languageEnglish
Title of host publicationNonlinear Frequency Generation and Conversion
Subtitle of host publicationMaterials and Devices XX
EditorsPeter G. Schunemann, Kenneth L. Schepler
PublisherSPIE
ISBN (Electronic)9781510641754
DOIs
Publication statusPublished - 2021
EventNonlinear Frequency Generation and Conversion: Materials and Devices XX 2021 - Virtual, Online, United States
Duration: 6 Mar 202111 Mar 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11670
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNonlinear Frequency Generation and Conversion: Materials and Devices XX 2021
CountryUnited States
CityVirtual, Online
Period06.03.202111.03.2021

Keywords

  • Beam clean-up
  • Diode pumping
  • FBG
  • Fiber laser
  • Graded-index fiber
  • Mode selection
  • Multimode
  • Pump depletion
  • Raman laser
  • Random coupling

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