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为满足激光加工、激光彩色显示、数据存储、医疗卫生和科研等领域对绿光激光器的需要,研制了一台高倍频效率、窄脉宽侧面泵浦腔外倍频的YAG/LBO绿光激光器。分析并计算了腔外最佳聚焦参数,确定了透镜的最佳聚焦焦距。实验中,利用808nm激光二极管侧面泵浦Nd:YAG晶体,使用BBO晶体进行加压式调Q,采用四分之一波片补偿Nd:YAG晶体的热退偏,最终实现了重复频率1kHz、输出功率10.7W的1 064nm输出,最大单脉冲能量为10.7mJ。在此基础上,采用Ⅰ类温度相位匹配LBO晶体对基频光进行腔外倍频,获得了重复频率1kHz、脉宽21ns、最大输出功率6.04W的532nm准连续绿光输出,倍频效率高达59.3%。
In order to meet the needs of green laser in the fields of laser processing, laser color display, data storage, medical treatment and research, a YAG / LBO green laser with high frequency efficiency and narrow pulse width side-pumped external frequency doubling . The best focusing parameters were analyzed and calculated to determine the best focusing focal length of the lens. In the experiment, Nd: YAG crystal was side-pumped by 808nm laser diode, and Q-switched crystal was pressed by QB. The quarter wave plate was used to compensate the thermal depolarization of Nd: YAG crystal. Finally, the repetition frequency of 1kHz was achieved and the output Power 10.7W 1 064nm output, the maximum single pulse energy of 10.7mJ. Based on this, the 532nm quasi-continuous green light with repetition frequency of 1kHz, pulse width of 21ns and maximum output power of 6.04W has been obtained by using Class I temperature phase-matched LBO crystal for extra-cavity frequency doubling. The frequency doubling efficiency is as high as 59.3%.