Broadly tunable continuous-wave Tm,Ho:SrF2 and Tm,Ho:BaF2 lasers

We report on the first, to our knowledge, room-temperature continuous-wave laser operation of Tm3+,Ho3+-codoped barium and strontium fluoride crystals at ∼2.1 µm. The 3 at.% Tm, 0.5 at.% Ho:BaF2 laser generated 160 mW at 2073 nm with a slope efficiency of 31.0% and a laser threshold of 43 mW. The co...

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Bibliographic Details
Published in:Optics letters 2024-10, Vol.49 (19), p.5631
Main Authors: Veselský, Karel, Loiko, Pavel, Eremeev, Kirill, Benayad, Abdelmjid, Braud, Alain, Šulc, Jan, Jelínková, Helena, Camy, Patrice
Format: Article
Language:English
Subjects:
Barium fluorides
Continuous wave lasers
Energy transfer
Holmium
Rare earth elements
Room temperature
Strontium fluorides
Tuning
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Summary:We report on the first, to our knowledge, room-temperature continuous-wave laser operation of Tm3+,Ho3+-codoped barium and strontium fluoride crystals at ∼2.1 µm. The 3 at.% Tm, 0.5 at.% Ho:BaF2 laser generated 160 mW at 2073 nm with a slope efficiency of 31.0% and a laser threshold of 43 mW. The continuous wavelength tuning of this laser from 2010 to 2090 nm (tuning range, 80 nm) was demonstrated. The spectroscopic properties of Tm,Ho:SrF2 and Tm,Ho:BaF2 crystals were also determined, showing enhanced Tm3+ → Ho3+ energy transfer in rare-earth clusters. For Ho3+ ions in BaF2, the stimulated-emission cross section is 0.40 × 10−20 cm2 at 2044 nm, and the thermal equilibrium luminescence lifetime is as long as 14.1 ms.
ISSN:0146-9592
1539-4794
1539-4794
DOI:10.1364/OL.532598