kHz、窄脉宽、高能量的脉冲激光光源在激光测距领域具有广阔的应用前景。依据晶体电光调Q与窄脉宽理论, 研究并设计了一种kHz、窄脉宽、高能量调Q的固体激光器。实验采用了一种适用于高占空比、高功率的LD端面泵浦构型, 利用三柱透镜耦合系统将泵浦光聚焦至工作物质内, 其最大光转化效率能达到27%；分别利用RTP晶体与KD*P晶体进行高重频电光调Q对比, 在近乎相同的静态输入下, KD*P晶体调Q获得了11 mJ的动态能量输出, RTP晶体的动态能量只有5. 64 mJ。最佳泵浦功率下, KD*P晶体的动静比接近80%, RTP晶体动静比接近40%。最后, 通过改变谐振腔的腔长, 验证了短腔法实现窄脉宽激光的可行性, 并在物理腔长为60 mm的情况下, 获得了5. 76 ns的窄脉宽激光。

The kind of kHz and high-energy pulse laser light source with narrow pulse width has broad prospect in the field of laser ranging. A high-energy, narrow-pulse-width and kHz Q-switching solid laser was designed based on the theory of electro-optical crystal Q-switching and narrow pulse width. A pumping configuration applicable for the high-duty-ratio and high-power LD end face was used in the experiment. The pumping light was focused on the operation material by using the prism coupling system, of which the maximum light conversion rate reached 27%. High-repetition-frequency electro-optical Q-switching effects was made by using RTP crystal and KD*P crystal respectively. With almost the same static input, KD*P crystal Q-switching obtained the dynamic energy output of 11 mJ, while the dynamic energy of RTP crystal was only 5. 64mJ. Under the conditions of optimum pumping power, the dynamic-to-static ratio of KD*P crystal was close to 80%, while the dynamic-to-static ratio of RTP crystal was close to 40%. Finally, by changing the length of the resonant cavity, the feasibility of the short cavity method to achieve the narrow-pulse-width laser output was verified. The narrow-pulse-width laser output of 5. 76ns was obtained for the physical cavity length of 60 mm.