Guillemot Lauren, Loiko Pavel, Soulard Rémi, Braud Alain, Doualan Jean-Louis, Hideur Ammar, Moncorgé Richard, Camy Patrice
Opt Lett. 2019 Aug 15;44(16):4071-4074. doi: 10.1364/OL.44.004071.
We report on novel upconversion (UC) pumping schemes for 2.3 μm thulium (Tm) lasers (the H3→H3 transition) based on a photon avalanche mechanism populating the intermediate metastable level (F3) acting as an effective ground state. The proposed pump wavelengths are ∼1 and ∼1.5 μm, each one corresponding to a resonant excited-state absorption transition F3→F3 and F3→H3, respectively. UC pumping at 1040, 1055, and 1451 nm of 2.3 μm Tm:LiYF lasers is demonstrated. In the former case, the laser generates 102 mW at 2302 nm with a slope efficiency of 14.6% (versus the incident pump power). The laser dynamics is studied. UC pumping is promising for reaching high efficiencies in 2.3 μm Tm lasers.
我们报道了基于光子雪崩机制的新型上转换（UC）泵浦方案，用于2.3微米铥（Tm）激光器（H3→H3跃迁），该机制使充当有效基态的中间亚稳能级（F3）得以填充。所提出的泵浦波长约为1微米和1.5微米，分别对应于共振激发态吸收跃迁F3→F3和F3→H3。展示了对2.3微米Tm:LiYF激光器在1040、1055和1451纳米处进行的UC泵浦。在前一种情况下，该激光器在2302纳米处产生102毫瓦的功率，斜率效率为14.6%（相对于入射泵浦功率）。对激光动力学进行了研究。UC泵浦对于实现2.3微米Tm激光器的高效率很有前景。
