Abstract

Yb:LuScO 3 晶体作为固体激光器的新型增益介质,其面形和表面质量严重影响激光器的光束质量,因此探索Yb:LuScO 3 晶体的超精度光学加工工艺参数具有重要意义。本文系统开展了Yb:LuScO 3 晶体超精密光学加工的工艺参数研究,针对Yb:LuScO 3 晶体在加工过程中容易破裂和表面质量较差的问题,提出了拼接上盘和树脂铜盘抛光垫的关键技术。首先,使用COMSOL Multiphysics有限元软件对拼接工艺中选取的不同保护垫料的应力进行仿真。接着,研磨阶段逐步减小B 4 C磨料的粒径。然后,粗糙阶段使用树脂铜盘作为抛光垫,并对树脂铜盘抛光垫的作用进行了分析。最后,使用激光二极管泵浦加工好的样品进行激光输出实验。实验结果表明:基于该技术加工后的晶体表面粗糙度RMS=0.296 nm,面形精度PV=53 nm。在1 086 nm处获得了8.3 W的连续激光输出,斜效率为58%。该加工方法可以广泛应用于Yb:LuScO 3 晶体的高精度加工。

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