Frontiers in Physics (Sep 2022)

Investigation of the confined-doped fiber on single-mode operating and power scaling in all-fiber single-frequency amplifiers

  • Wei Li,
  • Shuai Ren,
  • Yu Deng,
  • Yisha Chen,
  • Yao Lu,
  • Wei Liu,
  • Wei Liu,
  • Wei Liu,
  • Pengfei Ma,
  • Pengfei Ma,
  • Pengfei Ma,
  • Zhiyong Pan,
  • Zhiyong Pan,
  • Zhiyong Pan,
  • Zilun Chen,
  • Zilun Chen,
  • Zilun Chen,
  • Lei Si,
  • Lei Si,
  • Lei Si,
  • Pu Zhou

DOI
https://doi.org/10.3389/fphy.2022.1016047
Journal volume & issue
Vol. 10

Abstract

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In this paper, we proposed a strategy for achieving all-fiber single-frequency amplifiers with near-diffraction-limited beam quality by using confined-doped fiber. Benefiting from the large mode area (LMA) and mode selection properties of the confine-doped fiber, the stimulated Brillouin scattering (SBS) and transverse mode instability (TMI) effects were comprehensively suppressed. Based on this confined-doped fiber assisted amplifier, a 322 W SBS-limited single-frequency laser was obtained with M2 factor of 1.25/1.33 for the x/y direction. Comparing with the full-doped fiber assisted one, the TMI threshold of the confined-doped one is improved more than 1.6 times. Overall, the technique of confined-doped in the fiber core provides a promising approach for the power scaling and single-mode operation of all-fiber single-frequency lasers.

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