湍流大气中斜程传输光场的相位特性  

Phase characteristics of laser beams propagating along a slant path in turbulent atmosphere

作　　者：张晓欣[1] 韩开[1] 付福兴[1] 张彬[1] 

机构地区：[1]四川大学电子信息学院,成都610064

出　　处：《强激光与粒子束》2013年第8期1925-1929,共5页High Power Laser and Particle Beams

基　　金：中国科学院自适应光学重点实验室基金项目(LAOF201101);四川大学优秀青年学者科研基金项目

摘　　要：运用功率谱反演法对斜程传输大气湍流扰动相位屏进行了数值模拟。通过建立激光束初始畸变相位模型,从波前峰谷值和波前功率谱密度函数两个方面,对激光束通过大气湍流后的相位特性进行了研究,重点分析了湍流传输距离和天顶角对激光束波前相位分布的影响。研究结果表明:激光束在湍流大气斜程传输后,其波前相位会发生明显畸变,且空间高频相位较低频相位所占比例明显增加;通过湍流后的波前相位与传输距离及天顶角密切相关,传输距离越长,天顶角越大,相位畸变程度越大,高频相位所占比例越多。The turbulent distribution phase screen along a slant path has been simulated by using the method of power spec trum inversion. By constructing the initial distorted wavefront phase model, the phase characteristics of the laser beam propaga ting along a slant path has been studied from the view of wavefront peak-valley value and the wavefront power spectral density function. The influences of propagation distance and zenith angle on the phase distortion of laser beams in turbulence have been analyzed. The results show that the wavefront phase of laser beams distorts obviously after propagating along a slant path in the turbulent atmosphere, and the distortion of high frequency phase increases; the wavefront phase of laser beams propagating along a slant path in the turbulent atmosphere is closely related to the propagation distance and zenith angle. The longer the propagation distance or the bigger the zenith angle is, the more distorted the high frequency phase becomes.

关 键 词：斜程传输 相位畸变 高频相位 天顶角 传输距离 

分 类 号：O439[机械工程—光学工程]