High-power Random Raman Fiber Laser with an Ultrashort Random Fiber Grating

Jiancheng Deng, Ming Shen, Yanxin Li, D. V. Churkin, Xuewen Shu

Research output: Contribution to journalArticlepeer-review

Abstract

We propose and demonstrate the power scalability in a novel random Raman fiber laser (RRFL) with localized random feedback provided by an ultrashort low-reflection random fiber grating (RFG). The RFG is composed of a randomly distributed sub-grating array, and is directly written by a femtosecond laser with point-by-point inscription approach. The fabricated RFG has a total length of only 1.86 mm and thus has relatively broad reflection peaks. A narrow-band high-reflection fiber Bragg grating at the end of the Fabry-Perot cavity can easily implement spectral filtering to ensure that the RRFL only lases at the wavelength of the highest reflection peak of the RFG due to the large wavelength separation between adjacent reflection peaks in RFG. The RRFL has a low threshold of 2.16W and a high slope efficiency of 91.56%, and the optical signal-to-noise ratio is 55 dB. Moreover, the spectral broadening of this RRFL is proved to be turbulence-induced square-root broadening.

Original languageEnglish
Pages (from-to)2535-2540
Number of pages6
JournalJournal of Lightwave Technology
Volume40
Issue number8
DOIs
Publication statusPublished - 15 Apr 2022

Keywords

  • Distributed feedback devices
  • femtosecond laser writing
  • high power lasers
  • Laser feedback
  • Optical fiber theory
  • Power lasers
  • Raman fiber lasers
  • random fiber gratings
  • random lasers
  • Rayleigh scattering
  • Reflection
  • Stimulated emission
  • Femtosecond laser writing

OECD FOS+WOS

  • 1.03.SY OPTICS
  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY
  • 2.02.YE TELECOMMUNICATIONS
  • 2 ENGINEERING AND TECHNOLOGY

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