振幅起伏对自适应光学系统的限制

Limitations of amplitude fluctuation on adaptve optics system

本文讨论了补偿前以及经柔形镜对位相畸变完全校正后的光强分布和斯特列尔比,分析了振幅起伏对自适应光学技术的基本限制。结果表明:振幅起伏的影响最严重时补偿后的中心光强仅为衍射极限的一半,斯特列尔比的极限值在最低时为0.5。

By discussing intensity distribution, and Strehl's ratio before and after perfect phase compensation with a rube-mirror, the limitations of amplitude fluctuation on adaptive optics system are analysed. Although phase distortion can be corrected perfectly, there is a theoretical limit on compensation because the amplitude distortion can not be compensated. A general expression of the limit Strehl's ratio which is variated in whole region of fluctuation is derived. The theories show that the corrected peak intensity is only half of the diffraction intensity when amplitude fluctuation is maximum, the lowest value of the Strehl's ratio limit is 0.5.