为了获得均匀化、平顶的高功率激光束,设计了一种以平面镜为输出镜、凹面镜为全反镜的新型谐振腔结构,由于凹面镜的周期摆动使得输出光束强度分布得到一个时间上的均匀化,得到近似的“平顶”高斯型。建立了理论模型,并对该整形方式进行理论分析与数值模拟。理论计算和实验结果都表明,采用这种新型的整形方式,CO2激光器输出光束光强的空间分布得到了明显的均匀化。此方法避免了传统高功率激光光束整形的弊端,提高了系统的可靠性,简化了结构设计。

In order to acquire uniform and flatten Gaussian beam, a new resonator is designed. The beam intensity distribution is modified to obtain greater temporal uniformity by reflector′s periodically vibrating. The theoretical model of this beam shaping was built and analyze. Simulated and experimental results are presented that the high-power CO2 laser beam intensity distribution uniformization can be achieved using the new resonator. The novel method avoided some shortcoming in high power CO2 laser beam shaping and simplified the whole system.