非科尔莫戈罗夫湍流情况下光学波前的到达角起伏方差分析

Analysis of Arrival-of-Angle Fluctuations of Optical Wavefront for Non-Kolmogorov Turbulence

引入非科尔莫戈罗夫 (Kolmogorov)湍流情况下的归一化相位空间功率谱 ,针对 G倾斜和Z倾斜两种情形 ,分别推导了非科尔莫戈罗夫湍流情况下光学波前的到达角起伏方差与相位空间功率谱指数下降因子β和归一化大气湍流相干长度ρ0 之间的关系。结果表明 ,对于 2 <β <4 ,非科尔莫戈罗夫湍流情况下光学波前的到达角起伏方差随着β的增加而增大 ,β相同时 ,G倾斜方差总是小于 Z倾斜方差。

For Z- tiltand G- tilt,the variances of the arrival- of- angle fluctuations of optical wavefront,which are functions of the power- law exponentβand the generalized coherencelengthρ0 ,are deduced by introducing the generalized phase spatial powerspectrum fornon- Kolmogorov turbulencerespectively.The results show that for2 <β <4,the variances of the arrival- of- angle fluctuations of optical wavefrontbecome larger and larger with the increasing of the power- law exponentβand the variance of G - tilt is smaller than thatof Z - tilt for the same β.