激光武器变焦发射系统参数设计与特性分析  

Parameters Design and Characteristics Analysis of the Laser Weapons Variable-Focus Emission System

作　　者：张宁华 严毅[1] 周树平[1] 谢光辉[1] Zhang Ninghua;Yan Yi;Zhou Shuping;Xie Guanghui(China Airborne Missile Academy,Luoyang 471009,China)

机构地区：[1]中国空空导弹研究院,河南洛阳471009

出　　处：《航空兵器》2019年第2期29-33,共5页Aero Weaponry

摘　　要：为实现对远场飞行目标的有效毁伤,激光武器发射系统需具有一定精度的变焦能力。本文基于高斯光束的传输变换理论,利用MATLAB软件首先对卡塞格伦共轴变焦发射系统的参数设计及聚焦特性进行了详细的分析。结果表明该系统的聚焦距离存在一个极大值,该极大值与主发射镜的曲率半径成正比,与副发射镜扩束后的光束虚束腰半径成反比;当主、副发射镜具有相同的焦点间距时,聚焦光斑处的功率密度与二者均成反比。其次,理论推导了最大聚焦距离与系统口径的平方正比关系。最后对变焦精度进行了分析,结果显示随着虚束腰半径的减小,变焦精度变差,故为了满足变焦精度的需求,虚束腰半径存在一个极小值,进一步结合入射光束的参数即可确定副发射镜的曲率半径和口径大小。In order to achieve the effective damage of the distant flight target, the emission system of laser weapons should possess the ability of variable-focus with a certain precision. The parameters design and focusing characteristics of the Cassegrain co-axial variable-focus emission system are analyzed computationally in detail using the software MATLAB according to the theory of the Gaussian beam transformation. The results show that the focusing distance has a maximum value, which is proportional to the curvature radius of the main mirror and inversely proportional to the virtual beam waist radius of the sub mirror. Meanwhile, the power intensity of the focused beam spot is inversely proportional to the curvature radius of the main mirror and the virtual beam waist radius of the sub mirror in the same separation distance between the focal points of the main and sub mirrors. The square proporitional relationship between the maximum focusing distance and the system aperture size is derived theoretically. The results that the accuracy of the variable-focus becomes poor according to the decrease of the virtual beam waist radius have been shown based on the analyses. Therefore, there is a minimum value of the virtual beam waist radius to satisfy the accuracy of the variable-focus. Furthermore, the curvature radius and the diameter of the sub mirror can be determined by the combination of the parameters of the incident laser beam.

关 键 词：激光武器 光束变换 变焦系统 聚焦发射 

分 类 号：TJ95[兵器科学与技术—武器系统与运用工程]