论文部分内容阅读
为了与大面积放电增益区匹配,千瓦级射频板条CO2激光器采用大菲涅尔数的条状离轴负支共焦非稳腔,其输出模式是对整个输出平面上光场分布在特定区间的截断,对应的傅里叶谱(空间频率)会无限展宽。通过改进的虚源法求得其输出平面的场分布,然后通过对输出光场的傅里叶谱的分析,研究了条状离轴负支共焦非稳腔的两个主要参数——有效菲涅尔数Neq以及几何放大率M对输出光束质量的影响。数值模拟的结论显示输出光束的质量只与M相关,随着M的绝对值的增加,光束质量会呈现周期振荡式的下降,周期约为0.05。
In order to match the large-area discharge gain region, the kilowatt-class RF slab CO2 lasers adopt the large Fresnel strip-shaped negative off-axis negative branch confocal unstable cavity, and the output mode is to distribute the light field over the entire output plane in a specific section The corresponding Fourier spectrum (spatial frequency) will be infinitely widened. Through the improved virtual source method, the field distribution of the output plane is obtained. Then by analyzing the Fourier spectrum of the output light field, the two main parameters of the strip off-axis negative branch confocal unstable cavity - effective Effect of Fresnel Neq and Geometric Magnification M on Output Beam Quality. The numerical simulation results show that the quality of the output beam is only related to M, and with the increase of the absolute value of M, the beam quality will show a periodic oscillatory decline with a period of about 0.05.