Veselský Karel, Loiko Pavel, Eremeev Kirill, Benayad Abdelmjid, Braud Alain, Šulc Jan, Jelínková Helena, Camy Patrice
Opt Lett. 2024 Oct 1;49(19):5631-5634. doi: 10.1364/OL.532598.
We report on the first, to our knowledge, room-temperature continuous-wave laser operation of Tm,Ho-codoped barium and strontium fluoride crystals at ∼2.1 µm. The 3 at.% Tm, 0.5 at.% Ho:BaF 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:SrF and Tm,Ho:BaF crystals were also determined, showing enhanced Tm → Ho energy transfer in rare-earth clusters. For Ho ions in BaF, the stimulated-emission cross section is 0.40 × 10 cm at 2044 nm, and the thermal equilibrium luminescence lifetime is as long as 14.1 ms.
据我们所知，我们首次报道了掺铥、钬的氟化钡和氟化锶晶体在室温下的连续波激光运转，波长约为2.1 µm。3原子%铥、0.5原子%钬：氟化钡激光器在2073 nm处产生了160 mW的功率，斜率效率为31.0%，激光阈值为43 mW。该激光器实现了从2010到2090 nm（调谐范围80 nm）的连续波长调谐。还测定了掺铥、钬的氟化锶和氟化钡晶体的光谱特性，结果表明在稀土团簇中铥到钬的能量转移增强。对于氟化钡中的钬离子，在2044 nm处的受激发射截面为0.40×10⁻¹⁹ cm²，热平衡发光寿命长达14.1 ms。
