光学学报, 2019, 39 (10): 1006001, 网络出版: 2019-10-09
大视场猫眼镜头激光回波功率分布模型及特性分析 下载: 1016次
Laser-Echo-Power Distribution Model of Large-Field Cat-Eye Lens and Characteristics Analysis
光通信 自由空间光通信 光场分布 猫眼光学镜头 大入射角 optical communications free space optical communication light field distribution cat-eye optical lens large angle of incidence
摘要
以基于猫眼效应的逆向调制激光通信为应用背景,将猫眼镜头的角失调量转化为线失调量,在柯林斯(Collins)衍射公式的基础上建立了大视场猫眼回波功率分布模型。仿真分析了离焦量、入射角、猫眼口径和焦距对回波功率分布的影响及猫眼回波光束的原路返回特性,并进行了实验验证。结果表明:入射角越大,回波光斑的面积越小,衍射越强烈,且相同入射角下,猫眼的口径越大,焦距越小,回波光斑受入射角的影响就越小;同等离焦量下正离焦回波光斑的发散角小于负离焦;猫眼回波的中心偏移量与入射角和离焦量呈线性关系,且存在一个正离焦量值使回波光束能够原路返回。
Abstract
Considering the cat-eye effect based retro-modulating laser communication as the application background, a large-field cat-eye echo power distribution model is established based on the Collins diffraction formula by transforming the angular misalignment of the cat-eye lens into a line offset. The effects of the defocusing amount, incident angle, cat-eye diameter, and focal length on the echo power distribution and original return characteristics of the cat-eye echo beam are analyzed and verified with experiments. The results show that the larger the incident angle is,the smaller the echo spot area is,and the stronger the diffraction is. At the same incident angle, the larger the aperture of the cat-eye is, the smaller the focal length is, and the smaller the echo spot affected by the incident angle is. The divergence angle of the positive defocus echo spot at the same defocusing amount is smaller than that of the negative defocus. The center shift of the cat-eye echo varies linearly with both the incident angle and the defocusing amount, and there is a positive defocusing amount that causes the echo beam to return to the original path.
段帅军, 樊桂花, 张来线, 刘瑞丰. 大视场猫眼镜头激光回波功率分布模型及特性分析[J]. 光学学报, 2019, 39(10): 1006001. Shuaijun Duan, Guihua Fan, Laixian Zhang, Ruifeng Liu. Laser-Echo-Power Distribution Model of Large-Field Cat-Eye Lens and Characteristics Analysis[J]. Acta Optica Sinica, 2019, 39(10): 1006001.