Wang Peifu, Jin Yicheng, Lv Jiawen, Zhang Ning, Xue Mengxin, Li Kuan, Dong Lulu, Liu Junting, Zhao Yongguang, Xu Xiaodong, Liu Shande
Opt Lett. 2023 Sep 1;48(17):4544-4547. doi: 10.1364/OL.501367.
We report on the spectral properties and laser performances of a novel, to the best of our knowledge, Tm,Ho:CaYLuAlO (Tm,Ho:CYLA) crystal. The polarized absorption spectra, luminescence spectra, and fluorescence lifetime are systematically investigated, presenting a broad and smooth luminescence band. Furthermore, a maximum continuous wave (CW) laser output power of 0.51 W at 2092 nm is obtained under an absorbed pump power of 2.89 W, corresponding to a slope efficiency of 20.4%. The beam quality factors (M) are measured to be 1.04 in both the x and y axes. A tuning range of 123.4 nm, from 2017.8 nm to 2141.2 nm, is achieved in the CW regime by using a birefringent filter (BF). A stable passively Q switched Tm,Ho:CYLA laser employing Cr:ZnSe as a saturable absorber (SA) is realized for the first time, delivering the shortest pulse width of 560 ns with a transmittance of 1%. The results indicate that the Tm,Ho:CYLA crystal is an excellent laser medium for generating high-efficiency laser at ∼2 µm and has a potential in ultrafast laser generation.
据我们所知，我们报道了一种新型Tm,Ho:CaYLuAlO（Tm,Ho:CYLA）晶体的光谱特性和激光性能。系统地研究了其偏振吸收光谱、发光光谱和荧光寿命，呈现出一个宽而平滑的发光带。此外，在2.89 W的吸收泵浦功率下，在2092 nm处获得了0.51 W的最大连续波（CW）激光输出功率，对应斜率效率为20.4%。测量得到光束质量因子（M）在x和y轴上均为1.04。通过使用双折射滤光片（BF），在连续波模式下实现了123.4 nm的调谐范围，从2017.8 nm到2141.2 nm。首次实现了采用Cr:ZnSe作为可饱和吸收体（SA）的稳定被动调Q Tm,Ho:CYLA激光器，以1%的透过率输出了560 ns的最短脉冲宽度。结果表明，Tm,Ho:CYLA晶体是一种用于在~2 µm处产生高效激光的优异激光介质，并且在超快激光产生方面具有潜力。
