High-efficiency LD-pumped all-fiber Raman laser based on a 100 μm core graded-index fiber

E. A. Evmenova, S. I. Kablukov, I. N. Nemov, A. A. Wolf, A. V. Dostovalov, V. A. Tyrtyshnyy, D. V. Myasnikov, S. A. Babin

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

We demonstrate a high-power, high-efficiency Raman laser based on a 100 μm core graded-index (GRIN) fiber directly pumped by 915 nm multimode laser diode modules in all-fiber configuration. Optimization of GRIN fiber length and pumping scheme was performed. As a result, 62 W of CW power has been obtained at a wavelength of 954 nm with a slope efficiency of 85%. The joint action of Raman clean-up effect and mode-selection properties of special fiber Bragg gratings inscribed in the central part of the GRIN fiber core results in significant beam quality enhancement for the generated Stokes beam ( < 3) in comparison with that of the pump radiation ( > 30). In addition, the exact value of the operating wavelength near the Raman gain maximum was varied. To the best of our knowledge, this is the first study of the impact of a Raman gain spectral profile on the power, spectrum and beam quality parameter M 2 of multimode Raman laser. It appears that they very much dependent on the spectral region of Raman gain at which we work, when the wavelength is selected by a fiber Bragg grating inscribed in a multimode GRIN fiber.

Original languageEnglish
Article number095101
Number of pages7
JournalLaser Physics Letters
Volume15
Issue number9
DOIs
Publication statusPublished - 1 Sep 2018

Keywords

  • fiber Bragg grating
  • fiber optics
  • graded-index fiber
  • laser diode pumping
  • Raman gain spectrum
  • Raman laser
  • GEO2
  • CW
  • OPTICAL-FIBERS
  • DIODE
  • MULTIMODE

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