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

Abstract

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.

Theoretical and experimental investigation of Al3+ ion-suppressed phase-separation structures in rare-earth-doped high-phosphorus silica glasses

“…[7][8][9][10] However, with the rapid development of high-power fiber lasers, it has become difficult for low-concentration co-doped silica-based glasses to meet the requirements of high-power operation. [11][12][13][14] In recent years, RE-doped silica-based composite glasses (Re-SCGs) have attracted considerable attention due to their high gain efficiencies, tunable crystal-field environments, and unique thermodynamic properties. [15][16][17] As is known, the luminescence efficiency of RE ions is closely related to their chemical state and the surrounding chemical environment provided by the host glass.…”