Yu Xiaoxu, Eremeev Kirill, Pan Zhongben, Loiko Pavel, Chu Hongwei, Pan Han, Braud Alain, Camy Patrice, Li Dechun
Opt Express. 2024 May 20;32(11):19611-19625. doi: 10.1364/OE.517124.
We report on the Czochralski crystal growth, polarized optical spectroscopy, and the first continuous-wave laser operation of 1.5 at.% Tm:LuVO crystal on the H → H transition. The polarized absorption and stimulated-emission properties of Tm ions in LuVO were revised and the crystal-field splitting of the Tm multiplets was determined by low-temperature (12 K) spectroscopy. The maximum stimulated-emission cross-section for the H → H transition is 2.48 × 10 cm at 2363 nm for π-polarization corresponding to an emission bandwidth of 28 nm. Evidence of phonon-assisted emissions of Tm ions above 2 µm is presented. The broadband emission properties of the Tm:LuVO crystal make it promising for ultrashort pulse generation. Additionally, pumped by a 796 nm fiber-coupled laser diode, the Tm:LuVO laser generated a Watt-level output power at 2279-2295 nm with a slope efficiency of 9.2% and linearly polarized emission (π-polarization).
我们报道了提拉法晶体生长、偏振光谱以及1.5原子百分比铥掺杂钒酸镥（Tm:LuVO）晶体在H→H跃迁上的首次连续波激光运转。修正了钒酸镥中铥离子的偏振吸收和受激发射特性，并通过低温（12 K）光谱确定了铥多重态的晶体场分裂。对于H→H跃迁，在2363 nm处，π偏振的最大受激发射截面为2.48×10⁻¹⁹ cm²，对应发射带宽为28 nm。给出了铥离子在2 µm以上的声子辅助发射证据。Tm:LuVO晶体的宽带发射特性使其在超短脉冲产生方面具有潜力。此外，由796 nm光纤耦合激光二极管泵浦时，Tm:LuVO激光器在2279 - 2295 nm处产生了瓦级输出功率，斜率效率为9.2%，且发射为线偏振（π偏振）。
