为了获得满足2 μm相干多普勒激光雷达使用的激光光源,进行了注入锁定固体激光器的实验研究。种子激光器采用双端镀腔膜的Tm,Ho:YLF微片晶体,在低温液氮环境下,获得单纵模稳频激光输出。从激光器采用有利于单纵模运转的环形腔结构,并利用熔融石英声光调Q获得脉冲输出。通过注入锁定,实验获得激光输出波长为2.067 μm,在重复频率大于20 Hz时,激光器的最终单脉冲输出能量2 mJ,脉冲宽度为146 ns。实验论证了注入锁定系统激光器作为雷达光源的可行性,并理论分析了种子注入时环形腔内的初始光场分布。

Injection-locking solid-state laser is studied to obtain the laser light for 2 μm coherent doppler lidar. Tm,Ho:YLF microchip crystal with both ends coated is used for the master laser. In order to obtain pulse laser, the structure of slave laser is toroidal and an infrared fused silica is used as acousto-optic Q-switch. The master laser as a seed is injected into the slave laser. Via injection-locked and amplification, the single longitudinal-mode and frequency-stabilization pulse 2 μm laser is obtained. A Q-switch output energy is 2 mJ at 20 Hz with a pulse width of 146 ns, and 4 mJ with a pulse width of 86 ns. The wavelength of the output is 2.067 μm. The feasibility is demonstrated that the injection-locking laser is used for 2 μm coherent doppler lidar. The initial optical field in the ring laser is discussed.