Study an Observation Method of Space Debris Environments by a Laser Radar

激光雷达的探测能力在很大程度上取决于激光器的输出功率和光学天线的性能。激光器的辐射图案应尽可能均匀，无暗斑。实验表明，如果将传统的W级高功率激光器应用于无线用途，则由于图案的劣化，激光雷达的特性显著劣化。为了使大面积激光器的辐射方向图平滑化，提出了一种设计方法，并设计了高性能光学天线馈电系统中的副反射镜和透镜的成形方法，作为最能容忍制造误差的反射镜成形方法。仿真结果表明了该方法的有效性，通过多路激光器输出功率的空间叠加，获得了较强的照明光和接收光。并且可以限制在单模激光器中显著的散斑效应。这一事实得到了实验的证实。

The detection capability of laser radars strongly depends on the output of a laser and the performance of an optical antenna. The radiation pattern of the laser should be uniform without dark spots as much as possible. It was experimentally shown that the characteristics of the laser radar is significantly degraded due to the deterioration of the patterns, if a conventional high power laser of W-class is applied to wireless uses. The design method was derived to smooth the radiation pattern of a broad area laser which is most promising for these applications.It is contrived to shape a sub-reflector and a lens in the feed system of a high-performance optical antenna as the reflector shaping method which is most tolerant to manufacturing errors. The validity was shown through simulation.Strong illuminating and receiving lights are obtained by spatially superimposing the output powers from plural lasers. And it is possible to restrict the speckle effect which is significant in a single mode laser. This fact was confirmed experimentally.