适用于波前处理器的自适应光学系统非共光路像差补偿方法

Compensation of the Non-common Path Aberrations in an Adaptive Optics System with a Wavefront Processor

提出了一种适合硬件形式波前处理器的非共光路像差校正方法.讨论了非共光路像差的产生原因和运用相位差异技术检测非共光路像差的方法.根据波前处理器的工作流程,推导了将非共光路像差折算到波前探测器参考点偏移量的算法,编写了实现算法的主控计算机软件模块.在望远镜光路中以光源为目标开展实验,用本文算法校正后,目标能量集中度提高了17.6%,证明了该方法的可行性.

Non-Common Path Aberrations （NCPA） often exist in adaptive optics system, due to the discrepancy between sensing path and imaging path. A method for correcting NCPA was presented, which is very suitable for wavefront processors in forms of hardware. First, causes of NCPA were analyzed and NCPA examination with phase diversity was discussed. Then, according to the working process of wavefront processors, an algorithm which converts NCPA to reference spot shifts of the wavefront sensor was deduced, and a software module in main controller computer was programmed for implementing this algorithm. Finally, an experiment with a light source as a target was conducted in the optical path of a telescope. Experiment results show that energy concentration of the target image is increased by 17.6% approximately after NCPA correction with this method. The experiment proves that this method is capable of NCPA correction for adaptive optics system.