Distributed and side-pumped fiber laser using a laser diode bar stack

Yin Wen Lee, Wei Chun Huangfu, Yen Yin Li, I. Chou Wu, Sheng Lung Huang, Shien Kuei Peter Liaw, Mark Dubinskii

Research output: Contribution to journalArticle

Abstract

A distributed, side-pumped Yb3+-doped fiber laser is demonstrated using a laser diode stack as a pump source. Four subwavelength gratings fabricated on the same fused-silica substrate were aligned with four laser diode bars of the laser diode stack package for coupling pump light into double-clad fibers. Under the 975-nm pump power of 124.6 W, a 58 W Yb3+-doped fiber laser has been demonstrated. Due to the distributed pumping scheme, the nonuniformity of fiber heating from quantum defect is reduced as seen from the narrow linewidth of the fiber laser output across the entire pump power range. As a further step, the genetic algorithm method was used to design an aperiodic grating with a 40-nm fine structure. The adoption of the aperiodic grating, fabricated by using the E-beam lithography process, reduced the edge coupling loss effect, which allowed to reach 70% coupling efficiency. The side pumping scheme is compact and efficient, and power scaling is possible with more laser diode bars in the laser diode bar stacks. To the best of our knowledge, this is the first demonstration of a distributed pumped fiber laser using a laser diode bar stack as the pump source.

Original languageEnglish
Article number8533341
Pages (from-to)70456-70462
Number of pages7
JournalIEEE Access
Volume6
DOIs
Publication statusPublished - Jan 1 2018

Keywords

  • fiber lasers
  • gratings
  • Optical pumping
  • semiconductor laser arrays

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)

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  • Cite this

    Lee, Y. W., Huangfu, W. C., Li, Y. Y., Wu, I. C., Huang, S. L., Peter Liaw, S. K., & Dubinskii, M. (2018). Distributed and side-pumped fiber laser using a laser diode bar stack. IEEE Access, 6, 70456-70462. [8533341]. https://doi.org/10.1109/ACCESS.2018.2881208