湍流大气中激光传输对傅里叶望远镜成像质量的影响  

Effects of laser propagation through atmospheric turbulence on imaging quality in Fourier telescopy

作　　者：李杨[1,2] 相里斌[3] 张文喜[2,3] 

机构地区：[1]中国科学院西安光学精密机械研究所,西安710119 [2]中国科学院研究生院,北京100049 [3]中国科学院光电研究院,北京100094

出　　处：《强激光与粒子束》2013年第2期292-296,共5页High Power Laser and Particle Beams

基　　金：国家重点基础研究发展计划项目(2009CB724005)

摘　　要：针对傅里叶望远镜系统激光在湍流大气中传输造成的成像质量下降,分析了湍流对光束传输特性的影响,指出成像质量的下降主要来自于上行传输链路中湍流造成的光束漂移与光束扩展,从而产生光束指向误差。分析了指向误差影响成像的机理。通过数值计算得出了不同强度湍流造成整条上行链路光束指向误差,并通过系统仿真,得到了不同强度大气湍流条件下的成像结果。结果显示:在弱湍流与中湍流条件下(大气折射率结构常数小于10-14 m-2/3),随机指向误差较小(偏移比小于0.06),复原图像有较好的识别性;在强湍流条件下,成像质量下降严重。因此系统应选择避开强湍流地理位置与时段进行工作。In order to determine the imaging quality degradation caused by the laser propagation through atmospheric turbu- lence in the Fourier telescopy system, the effects of turbulence on beam propagation characteristics are analyzed. We pointed out that the degradation in the quality of imaging is mainly from the beam wander and beam spreading induced by atmospheric turbu- lence that arises the pointing error. The mechanism of the pointing error affecting imaging process is analyzed. The pointing er- rors caused by turbulence of the entire uplink are calculated and imaging results are simulated under different atmospheric condi- tions. It is concluded that in weak and moderate turbulence （the refractive index structure constant of atmospheric turbulence is less than 10^14 m^- 2/3）, the random pointing error is small （the random pointing offset proportion is less than 0.06） while the re- constructed image has good recognizability. However, in strong turbulence, imaging quality suffers severe decline. Thus the Fou rier telescopy should be selected to avoid the strong turbulence location and time.

关 键 词：傅里叶望远镜 大气湍流 指向误差 成像仿真 

分 类 号：TN249[电子电信—物理电子学]