光学学报, 2011, 31 (12): 1214002, 网络出版: 2011-11-28
自适应光学系统内光路的像差校正研究
Study of Aberration Correction in Light Path of Adaptive Optical System
摘要
自适应光学系统内光路像差的校正对获得好的光束质量至关重要。实际中采用的校正方案是常规共轭式自适应光学。然而系统菲涅耳数较小时,激光在传输过程中的衍射效应严重影响着系统内光路像差的校正效果。基于随机并行梯度下降算法模拟了不同程度衍射效应(以菲涅耳数表征)下的校正效果,模拟结果表明,像差校正效果随着菲涅耳数的变小而变差。同时在此基础上提出了改进方案,并基于双液晶空间光调制器进行了实验研究。模拟和实验结果均表明,同等条件下改进方案的校正效果明显优于常规共轭式自适应光学校正方案的校正效果,且前者像差校正效果几乎不受衍射效应的影响。
Abstract
The correction of the aberrations in light path of adaptive optical system is of great importance. However, the diffraction effect of the laser beam propagation in the adaptive optical system limits the correction effect of the aberration. By means of stochastic parallel gradient descent, correction effect under different Fresnel numbers is calculated, and an improved method is proposed. The simulated and experimental result indicates that the compensative effect decreases with the decrease of Fresnel numbers, and the correction effect of the improved solution is better than the traditional solution, and little influence of the diffraction effect is on the correction effect of the aberration with the former.
蒋鹏志, 马浩统, 邹永超, 杜少军. 自适应光学系统内光路的像差校正研究[J]. 光学学报, 2011, 31(12): 1214002. Jiang Pengzhi, Ma Haotong, Zou Yongchao, Du Shaojun. Study of Aberration Correction in Light Path of Adaptive Optical System[J]. Acta Optica Sinica, 2011, 31(12): 1214002.