激光大气传输相位屏的时间相关性测量

为了提高动态大气湍流模拟相位屏时间上的模拟精度, 提出了利用时间协方差测量时间相关性的方法, 在基于液晶空间光调制器(LC-SLM)的大气湍流相位屏模拟方法、时间特性等方面开展了研究。采用功率谱反演法生成湍流模拟相位屏, 给出了时间变量及时间功率谱的计算方法, 搭建了基于LC-SLM的大气湍流相位屏模拟实验系统, 并对上述方法进行了实验验证。实验结果表明: 激光畸变损失情况下, 时间协方差的计算误差可控制在8.0％左右, 且该模拟方法下相位屏的时间模拟精度较好。

Abstract

In order to improve the simulation accuracy on the phase screen of dynamic atmospheric turbulence simulation, a method for measuring time correlation using time covariance is proposed. Research has been carried out on atmospheric turbulence phase screen simulation methods based on liquid crystal spatial light modulators(LC-SLM), time characteristics, etc. The power spectrum inversion method is used to generate a turbulence simulation phase screen, and then the calculation method of the time variable and time power spectrum is given. Finally, an atmospheric turbulence phase screen simulation experiment system based on LC-SLM is established, and the above method is verified experimentally. The experimental results show that in the case of laser distortion loss, the calculation error of the time covariance can be controlled to about 8.0％, and the time simulation accuracy of the phase screen is better under this simulation method.

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丛明慧, 倪小龙, 刘智, 张小琪, 姚海峰. 激光大气传输相位屏的时间相关性测量[J]. 光通信技术, 2020, 44(10): 28. CONG Minghui, NI Xiaolong, LIU Zhi, ZHANG Xiaoqi, YAO Haifeng. Time correlation measurement of laser atmospheric transmission phase screen[J]. Optical Communication Technology, 2020, 44(10): 28.

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