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- W4310355104 abstract "We study an opportunity to obtain low-threshold random Raman lasing in multimode diode-pumped graded-index (GRIN) fiber with enhanced backscattering in artificial fs-inscribed random structure. Proof-of-principle experiments have been performed with a 1-km multimode GRIN fiber of 100-µm core directly pumped by three fiber-combined high-power 940- nm LDs. The laser has half-open all-fiber cavity consisting of highly-reflective FBG which is UV-inscribed in GRIN fiber near the LD input and artificial random reflector near its output end. Different types of random structures were formed by the point-by-point femtosecond-pulse technique in the near-axis area of GRIN fiber core (different pitch, length and transverse profile). Comparison of their lasing properties in the multimode diode-pumped GRIN fiber has been performed. The lowest threshold of ~140 W and the highest output power of 6.2 W (at ~180 W pumping) with the beam quality M<sup>2</sup>~3.3 is achieved for 2D structure. It is shown that the quality is improved to M<sup>2</sup>~2.4 for 1D structure at the expense of slight reduction in output power (5.5 W)." @default.
- W4310355104 created "2022-12-09" @default.
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- W4310355104 date "2022-12-28" @default.
- W4310355104 modified "2023-10-18" @default.
- W4310355104 title "Random lasing in multimode diode-pumped graded-index fiber based on artificial Rayleigh scattering in fs-inscribed random structure" @default.
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- W4310355104 doi "https://doi.org/10.1117/12.2644088" @default.
- W4310355104 hasPublicationYear "2022" @default.
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