高斯光束空间传输小光斑可调系统的设计  

Design of small spot adjustable system for Gaussian beam in space optical communication

作　　者：顾吉林[1] 许文海[1] 

机构地区：[1]大连海事大学信息科学与技术学院,辽宁大连116026

出　　处：《红外与激光工程》2010年第4期671-674,726,共5页Infrared and Laser Engineering

基　　金：国家科技支撑计划课题(2009BAG18B03)

摘　　要：针对空间远距离光通信、精确制导武器以及卫星导航等领域中高斯光束远场小发散角的严格要求和固定的光电检测平面,提出了高斯光束光斑半径大小可调系统的算法。当天线主镜上发射的光斑和光电检测平面接收点的光斑大小相同时,就相当于高斯光束零发散角。主副镜焦距确定的条件下,根据所要求光斑的大小以及光斑监测点的位置,采用移动失调的卡塞格伦天线的主副镜的位置关系来达到接收光斑半径大小可调的目的。当目标距离为10 km范围内,光斑半径在40～60 mm,通过理论计算、设计和分析,发现调节失调的卡塞格伦天线可以增加天线的性能,灵敏度很高,并验证了其可行性。According to the strict requirements of small divergent angle of the far-field Gaussian beam and fixed detecting plane used in long distance laser communication,precision-guided weapon,and satellite navigation systems,etc,an algorithm was developed for small spot adjustable system for the Gaussian beam in space optical communication.When the light spot sent by the main lens of the antenna and the spot detected by photoelectricity detecting plane were consistent,a theory about Gaussian beam zero divergence angle was proposed.Under the condition of fixed focuses of the main and subsidiary lens,the radius of light spot can be adjusted by tuning the position of the main and subsidiary lens of maladjusted Cassegrain optical antenna according to the radius and position of detecting light spot.In the objective distance range of 10 km,and the light spot radius range between 40 mm and 60 mm,the theoretical calculation,design and analysis show that the antenna capability and sensitivity can be improved by tuning positions of the main and subsidiary lens.

关 键 词：高斯光束 卡塞格伦天线 发散角 光斑可调 

分 类 号：TN82[电子电信—信息与通信工程]