Brightness enhancement and beam profiles in an LD-pumped graded-index fiber Raman laser

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Brightness enhancement and beam profiles in an LD-pumped graded-index fiber Raman laser. / Kuznetsov, Alexey G.; Kablukov, Sergey I.; Podivilov, Evgeny V. et al.

In: OSA Continuum, Vol. 4, No. 3, 15.03.2021, p. 1034-1040.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{76109a25000045f280467549ba3dad86,

title = "Brightness enhancement and beam profiles in an LD-pumped graded-index fiber Raman laser",

abstract = "We demonstrate an efficient conversion of highly-multimode (M2∼34) pump beam from fiber-combined 938-nm laser diodes into a 976-nm Stokes beam of high quality (M2=1.7-2 at output powers 10-52 W) that results in record brightness enhancement (BE=73) for Raman lasers based on graded-index fiber (GIF) and other fibers. The measured shapes of the output beams in GIF show that the near-parabolic pump beam becomes depleted above the Raman threshold so that the hole in the pump beam profile is much broader than the generated Stokes beam of near-Gaussian shape. The effect is analyzed in frames of a radially-dependent balance model with an account for the mode-selective feedback by FBG, which qualitatively describes the high-quality Stokes beam generation and the hole formation, but the hole width (and its power broadening) as well as the BE values are not consistent with experiment. Possible reasons for the difference are discussed.",

author = "Kuznetsov, {Alexey G.} and Kablukov, {Sergey I.} and Podivilov, {Evgeny V.} and Babin, {Sergey A.}",

note = "Publisher Copyright: {\textcopyright} 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",

year = "2021",

month = mar,

day = "15",

doi = "10.1364/OSAC.421985",

language = "English",

volume = "4",

pages = "1034--1040",

journal = "OSA Continuum",

issn = "2578-7519",

publisher = "OPTICAL SOC AMER",

number = "3",

}

RIS

TY - JOUR

T1 - Brightness enhancement and beam profiles in an LD-pumped graded-index fiber Raman laser

AU - Kuznetsov, Alexey G.

AU - Kablukov, Sergey I.

AU - Podivilov, Evgeny V.

AU - Babin, Sergey A.

PY - 2021/3/15

Y1 - 2021/3/15

N2 - We demonstrate an efficient conversion of highly-multimode (M2∼34) pump beam from fiber-combined 938-nm laser diodes into a 976-nm Stokes beam of high quality (M2=1.7-2 at output powers 10-52 W) that results in record brightness enhancement (BE=73) for Raman lasers based on graded-index fiber (GIF) and other fibers. The measured shapes of the output beams in GIF show that the near-parabolic pump beam becomes depleted above the Raman threshold so that the hole in the pump beam profile is much broader than the generated Stokes beam of near-Gaussian shape. The effect is analyzed in frames of a radially-dependent balance model with an account for the mode-selective feedback by FBG, which qualitatively describes the high-quality Stokes beam generation and the hole formation, but the hole width (and its power broadening) as well as the BE values are not consistent with experiment. Possible reasons for the difference are discussed.

AB - We demonstrate an efficient conversion of highly-multimode (M2∼34) pump beam from fiber-combined 938-nm laser diodes into a 976-nm Stokes beam of high quality (M2=1.7-2 at output powers 10-52 W) that results in record brightness enhancement (BE=73) for Raman lasers based on graded-index fiber (GIF) and other fibers. The measured shapes of the output beams in GIF show that the near-parabolic pump beam becomes depleted above the Raman threshold so that the hole in the pump beam profile is much broader than the generated Stokes beam of near-Gaussian shape. The effect is analyzed in frames of a radially-dependent balance model with an account for the mode-selective feedback by FBG, which qualitatively describes the high-quality Stokes beam generation and the hole formation, but the hole width (and its power broadening) as well as the BE values are not consistent with experiment. Possible reasons for the difference are discussed.

UR - http://www.scopus.com/inward/record.url?scp=85105689478&partnerID=8YFLogxK

U2 - 10.1364/OSAC.421985

DO - 10.1364/OSAC.421985

M3 - Article

AN - SCOPUS:85105689478

VL - 4

SP - 1034

EP - 1040

JO - OSA Continuum

JF - OSA Continuum

SN - 2578-7519

IS - 3

ER -

ID: 28554441