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- W4200502470 abstract "We report tunable amplification and direct generation of two-color green lasers based on a 962-nm direct-pumping erbium-doped yttrium, scandium, gallium, and garnet (Er:YSGG) crystal for visible light in pulse mode. The signal light was generated by sodium fluorescein, which corresponds to the upconversion transition of the Er:YSGG crystal 4S3/2 → 4I15/2 transition (557 nm band) for achieving amplification and laser output. In the initial amplification demonstration, a maximum gain of 7.3 dB was demonstrated at 557 nm, and a tunable amplification range of 6 nm was achieved at 553–559 nm. By introducing the signal light seed source, a 555.72-nm green laser at a pulse repetition frequency (PRF) of 10 Hz with a pulse width of 190 μs, a maximum pulse energy of 1.55 μJ was obtained. This corresponded to an optical slope efficiency of 6.37% and output beam quality (M2) values of Mx2 = 11.1 and My2 = 9.4, for which the doping concentration was 5 at.%. Under a doping concentration of 35 at.%, another 556.76-nm green laser at a PRF of 10 Hz with a pulse width of 280 μs and a maximum pulse energy of 1.56 μJ was realized, which corresponds to an optical slope efficiency of 6.43% and M2 values of Mx2 = 9.1 and My2 = 7.2. To the best of our knowledge, this is the first report of directly pumping an Er:YSGG crystal to generate upconversion two-color green lasers." @default.
- W4200502470 created "2021-12-31" @default.
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- W4200502470 date "2022-01-01" @default.
- W4200502470 modified "2023-10-15" @default.
- W4200502470 title "Tunable amplification of visible light and two-color green lasers based on different doping concentration Er:YSGG crystal" @default.
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- W4200502470 doi "https://doi.org/10.1016/j.optmat.2021.111925" @default.
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