Coherent Raman lasing in a short polarization-maintaining fiber with a random fiber Bragg grating array

S. R. Abdullina, M. I. Skvortsov, A. A. Vlasov, E. V. Podivilov, S. A. Babin

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

We study Raman lasing in a 7 m polarization-maintaining fiber with an array of fiber Bragg gratings with random phases/amplitudes. After optimization of the grating number the threshold pump power decreases to 0.8 W, whereas generated Stokes power at 1092 nm grows linearly above the threshold, reaching ∼3 W for both forward and backward waves. A comparison of experimental data with a developed model shows what such a random laser generates in a coherent regime. Near the threshold, single-longitudinal-mode generation with a ∼50 kHz linewidth is obtained, whereas the number of generated modes grows with power exceeding ∼100 at ∼0.1 W. At higher power, a transition to an incoherent regime with different power increments is observed, while the linewidth grows nonlinearly reaching ∼80 pm. Insertion of a 30 m fiber before gratings enables ∼1.5 times higher backward Stokes power at a narrower linewidth. Additionally, tunable parametric generation around 1140 nm is observed.

Original languageEnglish
Article number105001
Number of pages7
JournalLaser Physics Letters
Volume16
Issue number10
DOIs
Publication statusPublished - 30 Aug 2019

Keywords

  • fibre Bragg grating (FBG)
  • Raman fibre laser
  • random distributed feedback
  • LASER

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