高能激光自主自适应光学系统及激光散斑效应  

High-Energy Laser System with Self-Sustaining Adaptive Optics and Laser Speckle Effect

作　　者：贾昱成 许倩[2] 孙建锋[2] 曾祥龙[1] 刘立人[2] 

机构地区：[1]上海大学通信与信息工程学院,上海200444 [2]中国科学院上海光学精密机械研究所空间激光信息传输与探测技术重点实验室,上海201800

出　　处：《光学学报》2016年第10期3-13,共11页Acta Optica Sinica

基　　金：国家自然科学基金(61505233)

摘　　要：设计了高能激光自主自适应光学系统,利用高能激光的主动照明探测方式对目标进行探测。由于接收到的探测回波光场受散斑效应的影响,因此建立了探测系统的物理模型,具体分析散斑效应的影响。通过散斑光强自相关函数,理论上分析确定了散斑的平均尺度;通过部分相干理论,研究了该系统接收面散斑孔径积分场复相关函数并讨论了不同散斑天线尺度比情况下的积分场复相关函数宽度;分析了目标的成像放大率和理想分辨率,讨论了物像尺度与焦平面光斑尺度之间的关系;通过系统的数值仿真,分析了不同尺度散斑对焦平面光斑阵列的影响;叠加大气湍流,确定了散斑场对大气湍流探测的影响。结果表明散斑尺度介于阵列子孔径和大孔径尺度之间为最佳设计,此时较高的位移测量精度和整体探测率可以兼得。A high-energy laser system with self-sustaining adaptive optics is designed, which uses active illumination detection method of high-energy laser to detect target. However, the echo field received is affected by speckles, and a physical model of the detection system is established to analyze speckle effect. The average scale of speckle is discussed based on the autocorrelation function of speckle intensity. The complex coherence function of speckles on the receiving plane is defined via the partial coherence theory, and the width of complex coherence function in the integral field with different scales of speckle patterns is discussed as well. The imaging magnification of target and the ideal resolution are derived, and the relationship between the image scale and the light spot scale on the focal plane is discussed. The effect of the spot array on the focal plane with different scales of speckles is analyzed by numerical simulation. By superimposing atmospheric turbulence, the effect of speckle field on the atmospheric turbulence detection is confirmed. The results show that the speckle scale between subaperture and large aperture is the best design, when the system has both high displacement measurement precision and high overall detection rate.

关 键 词：大气光学 激光散斑 部分相干理论 主动照明 波前探测 自适应光学 

分 类 号：TN29[电子电信—物理电子学]