Efficient continuous-wave Tm,Ho:CaF2 laser at 2.1µm.
Opt Lett
; 48(7): 1730-1733, 2023 Apr 01.
Article
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| MEDLINE
| ID: mdl-37221752
ABSTRACT
We report on the first, to the best of our knowledge, continuous-wave laser operation of a Tm3+,Ho3+-codoped calcium fluoride crystal at â¼2.1 µm. Tm,HoCaF2 crystals were grown by the Bridgman method, and their spectroscopic properties were studied. The stimulated-emission cross section for the 5I7 â 5I8 Ho3+ transition is 0.72 × 10-20 cm2 at 2025 nm, and the thermal equilibrium decay time is 11.0â
ms. A 3 at. % Tm, 0.3 at. % HoCaF2 laser generated 737â
mW at 2062-2088 nm with a slope efficiency of 28.0% and a laser threshold of 133â
mW. Continuous wavelength tuning between 1985 and 2114â
nm (tuning range 129â
nm) was demonstrated. The Tm,HoCaF2 crystals are promising for ultrashort pulse generation at â¼2 µm.
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Opt Lett
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2023
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Article