High Power Laser Science and Engineering (Jan 2023)

Experimental investigation of the stimulated Raman scattering effect in high-power nanosecond superfluorescent fiber source

  • Chaoyu Ning,
  • Shuzhen Zou,
  • Haijuan Yu,
  • Jiexi Zuo,
  • Xuechun Chen,
  • Shuang Xu,
  • Shifei Han,
  • Xinyao Li,
  • Wenjuan Wu,
  • Chaojian He,
  • Xuechun Lin

DOI
https://doi.org/10.1017/hpl.2023.72
Journal volume & issue
Vol. 11

Abstract

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In this work, we experimentally investigate the dependence of the stimulated Raman scattering (SRS) effect on the seed linewidth of a high-power nanosecond superfluorescent fiber source (ns-SFS). The results reveal that the SRS in the ns-SFS amplifier is significantly influenced by the full width at half maximum (FWHM) of the ns-SFS seed, and there is an optimal FWHM linewidth of 2 nm to achieve the lowest SRS in our case. The first-order SRS power ratio increases rapidly when the seed’s linewidth deviates from the optimal FWHM linewidth. By power scaling the ns-SFS seed with the optimal FWHM linewidth, a narrowband all-fiberized ns-SFS amplifier is achieved with a maximum average power of 602 W, pulse energy of 24.1 mJ and corresponding peak power of 422.5 kW. This is the highest average power and pulse energy achieved for all-fiberized ns-SFS amplifiers to the best of our knowledge.

Keywords