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Spectroscopy and efficient laser performances of a Tm,Ho:CaY0.9Lu0.1AlO4 crystal

OPTICS LETTERS (2023)

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Summary: We report on the spectral properties and high-efficiency broadband laser operation of a Tm:CaY0.9Gd0.1AlO4 (Tm:CYGA) crystal. The crystal exhibits broad absorption and emission spectra, offering a smooth gain band. A maximum continuous-wave laser output power of 1.43 W at 1967.8 nm, corresponding to a slope efficiency of 42.2%, is achieved with an absorbed pump power of 4.35 W. A tunable Tm:CYGA laser with a tuning range of 284.7 nm from 1837.5 to 2122.2 nm is realized using a birefringent filter (BF). The results demonstrate the potential of the Tm:CYGA crystal for generating high-efficiency broadband CW laser and ultrashort pulses in the 2-μm spectral range.

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Summary: We report the first continuous-wave laser operation of a Tm3+,Ho3+-codoped calcium fluoride crystal at around 2.1 μm. The crystals were grown by the Bridgman method and their spectroscopic properties were studied. A Tm,Ho:CaF2 laser with 3 at. % Tm and 0.3 at. % Ho generated 737 mW at 2062-2088 nm, with a slope efficiency of 28.0% and a laser threshold of 133 mW. Continuous wavelength tuning from 1985 to 2114 nm (tuning range: 129 nm) was demonstrated. The Tm,Ho:CaF2 crystals show promise for ultrashort pulse generation at around 2 μm.

OPTICS LETTERS (2023)

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Summary: In this study, a Tm,Ho:CALGO laser passively mode-locked by a GaSb-based SESAM is reported. The laser generates pulses as short as 52 fs, with a central wavelength of 2015 nm and a broad spectral bandwidth of 82 nm. The laser performance is attributed to the combined gain profiles of the dopants and the polarized spectroscopic properties of Ho3+ ions.

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