High-efficiency generation in a short random fiber laser

I.D. Vatnik, D.V. Churkin, Evgeni V. Podivilov, Sergey A. Babin

Research output: Contribution to journalArticlepeer-review


We demonstrate a high-efficiency random lasing in a 850 m span of a phosphosilicate fiber. Random distributed feedback owing to the Rayleigh backscattering in the fiber enables narrowband generation with output power of up to 7.3 W at the Stokes wavelength λS = 1308 nm from 11 Wof the pump power at λP = 1115 nm. The laser demonstrates unique generation efficiency. Near the generation threshold, more than 2 W of output power is generated from only 0.5 W of pump power excess over the generation threshold. At high pump power, the quantum conversion efficiency defined as a ratio of generated and pump photons at the laser output exceeds 100%. Itis explained by the fact that every pump photon is converted into the Stokes photon far from the output fiber end, while the Stokes photons have lower attenuation than the pump photons.

Original languageEnglish
Article number075101
Number of pages5
JournalLaser Physics Letters
Issue number7
Publication statusPublished - Jul 2014


  • raman laser
  • random distributed feedback laser
  • random laser


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