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报道了激光二极管(LD)侧面抽运的Nd:YAG薄片激光器。对影响侧面抽运薄片激光器性能的主要因素,即圆薄片增益介质内晶体光分布和沿径向的温度分布进行了理论分析和实验。实现了光-光转换效率为33.5%,峰值功率为230 W,光束参数乘积为21.6 mm·mrad的激光输出。实验结果表明,侧面抽运在薄片Nd:YAG晶体内可实现对称均匀的分布,沿径向的温度差大大减小;Nd:YAG/YAG薄片晶体的复合可满足侧面抽运的要求。这些技术和方法可应用于更高功率的侧面抽运薄片激光器。
A laser diode (LD) side-pumped Nd: YAG lamella was reported. The main factors affecting the performance of side-pumped laser, that is, the crystal light distribution and the radial temperature distribution in the thin-plate gain medium, are analyzed theoretically and experimentally. The laser output was achieved with a light-to-light conversion efficiency of 33.5%, a peak power of 230 W and a beam parameter product of 21.6 mm · mrad. The experimental results show that the lateral pumping can achieve a symmetrical and uniform distribution in the thin-film Nd: YAG crystal, and the temperature difference in the radial direction is greatly reduced. The composite of the Nd: YAG / YAG thin film can meet the requirement of side pumping. These techniques and methods are applicable to higher power side-pumping sheet lasers.