High-brightness all-fiber Raman lasers directly pumped by multimode laser diodes

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7 Citations (Scopus)

Abstract

High-brightness fiber laser sources usually utilize active rare-earth-doped fibers cladding-pumped by multimode laser diodes (LDs), but they operate in limited wavelength ranges. Singlemode-passive-fiber based Raman lasers are able to operate at almost any wavelength being pumped by high-power fiber lasers. One of the interesting possibilities is to directly pump graded-index (GRIN) multimode passive fibers by available high-power multimode LDs at 915-940 nm, thus achieving high-power Raman lasing in the wavelength range of 950-1000 nm, which is problematic for rare-earth-doped fiber lasers. Here we review the latest results on the development of all-fiber high-brightness LD-pumped sources based on GRIN fiber with in-fiber Bragg gratings (FBGs). The mode-selection properties of FBGs inscribed by fs pulses supported by the Raman clean-up effect result in efficient conversion of multimode pump into a high-quality output beam at 9xx nm. GRIN fibers with core diameters 62.5, 85 and are compared. Further scaling capabilities and potential applications of such sources are discussed.

Original languageEnglish
Article number15
Number of pages7
JournalHigh Power Laser Science and Engineering
Volume7
DOIs
Publication statusPublished - 13 Mar 2019

Keywords

  • beam cleaning
  • fiber laser
  • high brightness
  • laser diode pumping
  • Raman laser
  • BEAM
  • CW
  • EFFICIENCY

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