Zhou Xue, Li Jiatong, Yang Xianxian, Zhang Zhen, Fu Xiuwei, Nie Hongkun, Li Tao, Zhang Baitao, He Jingliang, Yang Kejian
Opt Express. 2025 Mar 24;33(6):12427-12435. doi: 10.1364/OE.557667.
Continuous-wave (CW) and acousto-optic (AO) Q-switched laser operations based on Tm:LGGG crystal have been investigated in the spectral region of 2-2.3 μm. In CW regime, laser emissions at 2006 nm, 2160 nm, and 2344 nm are obtained by using different cavity mirrors with selective coating. A maximum output power of 4.25 W is achieved at 2006 nm with a slope efficiency of 32.8%. By suppressing the intense laser emissions at around 2 μm, a total output power of 0.925 W at 2160 nm and 2344 nm is obtained, corresponding to a slope efficiency of 12.9%. Furthermore, single laser wavelength operation at 2344 nm is realized by suppressing the laser emissions within 2-2.2 μm, delivering a maximum output power of 0.27 W and a slope efficiency of 5.1%. To the best of our knowledge, this is the first demonstration of laser emissions at 2160 nm and 2344 nm for Tm:LGGG crystal. However, by using an acousto-optic modulator (AOM), only Q-switching laser operation is obtained at 2004 nm, and the shortest pulse width of 216 ns and maximum pulse energy of 600 μJ are obtained, corresponding to a maximum pulse peak power of 2.78 kW.
基于Tm:LGGG晶体，在2 - 2.3μm光谱区域研究了连续波（CW）和声光（AO）调Q激光运转特性。在连续波模式下，通过使用具有选择性镀膜的不同腔镜，分别在2006nm、2160nm和2344nm处获得了激光输出。在2006nm处获得了4.25W的最大输出功率，斜率效率为32.8%。通过抑制2μm附近的强激光发射，在2160nm和2344nm处获得了0.925W的总输出功率，对应斜率效率为12.9%。此外，通过抑制2 - 2.2μm范围内的激光发射，实现了2344nm单激光波长运转，最大输出功率为0.27W，斜率效率为5.1%。据我们所知，这是首次展示Tm:LGGG晶体在2160nm和2344nm处的激光发射。然而，通过使用声光调制器（AOM），仅在2004nm处获得了调Q激光运转，获得了216ns的最短脉冲宽度和600μJ的最大脉冲能量，对应最大脉冲峰值功率为2.78kW。
