为克服当前波前探测技术存在的固有问题, 提出了一种基于阵列激光导星(Laser Guide Star, LGS)的自适应光学系统。该系统可以有效消除聚焦非等晕效应的影响从而提高系统的波前探测精度, 由此大幅度增大激光导星自适应光学系统的大气湍流探测范围, 从而降低自适应光学系统对导星亮度的要求。阐释了该系统的闭环工作过程, 并依据其工作过程建立仿真模型, 数值仿真了该系统基于阵列激光导星的波前探测过程。最后对重构波前精度进行评估, 分析了仿真存在的误差。数值仿真结果显示: 该系统的波前重构精度较好, 校正残差为11%, 初步验证了利用阵列激光导星进行波前探测的可行性。

A kind of array laser guide star (LGS) based adaptive optics (AO) system was independently proposed in purpose to overcome inherent problems in current wavefront sensing techniques. It can effectively eliminate focus anisoplanatism and improve its own wavefront sensing accuracy, drastically widen the scope of atmospheric turbulence that a LGS AO system can detect, and lower the requirement of an AO system for the brightness of LGSs. Its closed-loop working process was interpreted. Based on this working process, its simulation model was built and its wavefront sensing process was numerically simulated based on array LGS. At last, the accuracy of wavefront reconstruction was estimated and the errors of simulation was analyzed. Simulation results have shown that the accuracy of wavefront reconstruction is favorable and residual correction error is 11%, which invalidates the feasibility of using array LGS for wavefront sensing.