激光外差探测中准直失配问题的研究

摘要

应用数值模拟的方法研究了信号光场分布为艾里函数，本振光场分布为高斯分布的激光外差探测过程中准直失配角对激光外差探测混频效率的影响；分析了基于艾里斑原理的接收光学系统抑制准直失配对混频效率影响的优缺点；提出了一种能够有效减小准直失配角对混频效率影响的信号接收技术---阵列探测器匹配接收技术。仿真结果表明这一匹配接收方法能够有效提高准直失配情况下的光电流的输出强度和混频效率，并能够有效提高接收机的视场。%Influence of collimation mismatch angle on laser heterodyne detection mixing efficiency is studied under the conditions of local beam optical field distribution as Gaussian distribution and signal beam optical field distribution as Airy function.The advantages and disadvantages of receiving optical system based on Airy disk principle in decreasing the influence of collimation mismatch on mixing efficiency are analyzed.In addition,a new method called array detec-tors matching receiving method is put forward,which effectively decreases the influence of collimation mismatch angle on mixing efficiency.Result shows this method can effectively improve the mixing efficiency and current output when collimation mismatch angle exists.By this method heterodyne detection under the condition of big collimation mis-match angle can be implemented.Furthermore,this method has wide receiving field of view.