摘要
针对神光Ⅲ主机装置使用的光学元件,基于分形理论,分析中高频相位畸变的统计分布特征,指出其满足分数布朗随机场,并利用结构函数法对分形维数进行计算,统计结果显示,大口径钕玻璃片的分形维数在2.34～2.43之间。利用局部稳态的随机中点位移法,提出一种新的表征光学元件相位的方法,将分形维数作为参数,可衡量中高频相位畸变,对高功率激光光学元件的评价有参考意义。
Based on the fractal theory, this paper analyzed statistical distribution features of middle-high frequency phase distortion of the optics for Shenguang-HI laser facility. The middle-high frequency phase distribution is found to be consistent with the model of fractional Brownian random field. The fractal dimension was calculated by structure function. The fractal dimension of large-aperture neodymium-doped phosphate amplifier glass is distributed between 2.34 and 2.43. A method of phase simulation by random midpoint-displacement was presented. In this method, the fractal dimension can be viewed as a parameter for estimating phase distortion, which helps to evaluate the high laser optics.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第5期1171-1175,共5页
High Power Laser and Particle Beams
关键词
光学元件
相位畸变
分形法
分数布朗随机场
钕玻璃
optics
phase distortion
fractal method
fractional Brownian random field
neodymium-doped phosphateamplifier glass
