High power red laser oscillation in Pr3+-doped waterproof fluoroaluminate glass fiber excited by a GaN laser diode

J. Nakanishi*, T. Yamada, Y. Fujitomo, O. Ishii, M. Yamazaki

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We have demonstrated a high power red fiber laser with a Pr-doped waterproof fluoro-aluminate glass fiber (Pr:WPFGF). When 800 mW pumping power of a blue/violet GaN laser diode (GaN-LD) was launched into the Pr:WPFGF (core diameter 8 μm, length 40 mm) with dielectric coating on both end surfaces to construct a resonator, the maximum output laser power at 638 nm was obtained to be 311.4 mW that is higher than previously reported Pr:ZBLAN fibers. The threshold power was evaluated to be 52.1 mW, and the slope efficiency was calculated to be 41.6%. Assuming the resonator to be a Fabry-Perot resonator, we can calculate the output power to be 336 mW at 800 mW pump power and the slop efficiency to be 44.2%. These theoretical values show good agreement with experimental ones.

Original languageEnglish
Title of host publicationSolid State Lasers XX
Subtitle of host publicationTechnology and Devices
Publication statusPublished - 2011
Externally publishedYes
EventSolid State Lasers XX: Technology and Devices - San Francisco, CA, United States
Duration: 2011 Jan 232011 Jan 27

Publication series

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


ConferenceSolid State Lasers XX: Technology and Devices
Country/TerritoryUnited States
CitySan Francisco, CA


  • Fiber lasers
  • Fluoride glasses
  • Optical fibers
  • Rare earth doped fiber

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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