Seven-core fiber Raman laser with fs-inscribed random structures

Mikhail I. Skvortsov, Victor I. Labuntsov, Alexey A. Wolf, Alexandr V. Dostovalov, Sergey A. Babin

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Abstract

We report on the demonstration and characterization of Raman laser generating at the wavelength of ~1090 nm with total output power of up to 5 W based on the 7-core passive fiber with coupled cores. The Raman gain in all cores is provided by the pump laser connected to the FBG-free central core, whereas the laser cavity is formed by two sets of highly-reflective fiber Bragg gratings (FBGs) inscribed by fs pulses in all peripherical cores at the both ends of the 7-core fiber. The output FBG set has got a random shift along the axis between individual FBGs thus forming a random array of FBGs. Along with the Stokes line narrowing reasoned by the reduction of spectral broadening via nonlinear effects due to the enlargement of effective mode area in the multicore fiber with coupled cores in comparison with a standard singlemode fiber Raman laser, the additional line narrowing effect induced by the multicore random FBG array has been also revealed. It results in the generation of single peak of <30 pm linewidth near the threshold, whereas the linewidth broadens to ~250 pm at maximum power. At that, the single peak generation at low powers is not stable in time converting at some moments to multiple 20-pm peaks with random spacing and amplitudes defined by the interference of beams reflected from individual output FBGs with random longitudinal shifts. The ways to stabilize the generated spectrum are discussed.

Original languageEnglish
Title of host publicationMicro-structured and Specialty Optical Fibres VII
EditorsKyriacos Kalli, Alexis Mendez, Pavel Peterka
PublisherSPIE
ISBN (Electronic)9781510643802
DOIs
Publication statusPublished - 2021
EventMicro-structured and Specialty Optical Fibres VII 2021 - Virtual, Online, Czech Republic
Duration: 19 Apr 202123 Apr 2021

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11773
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceMicro-structured and Specialty Optical Fibres VII 2021
CountryCzech Republic
CityVirtual, Online
Period19.04.202123.04.2021

Keywords

  • Femtosecond laser micromachining
  • Fiber Bragg grating
  • Multicore fiber
  • Raman laser
  • Random structure

OECD FOS+WOS

  • 1.03 PHYSICAL SCIENCES AND ASTRONOMY
  • 1.02 COMPUTER AND INFORMATION SCIENCES
  • 1.01 MATHEMATICS
  • 2.02.IQ ENGINEERING, ELECTRICAL & ELECTRONIC

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