激光束畸变波前高频相位的恢复  

Recovery of High Frequency Phase of Laser Beam with Wavefront Distortio

作　　者：付福兴[1] 张彬[1] 

机构地区：[1]四川大学电子信息学院,四川成都610064

出　　处：《中国激光》2011年第4期44-49,共6页Chinese Journal of Lasers

基　　金：中国科学院自适应光学重点实验室基金(LAOF201002)资助课题

摘　　要：利用相位均方根(RMS)梯度描述的随机相位屏表示低频波前畸变,用扰动幅度表征的随机相位屏描述高频波前畸变,建立了激光束的畸变波前模型。根据已知的近场低频相位以及近场和远场光强分布,采用逐次逼近迭代法对畸变波前的高频相位进行了恢复,并从波前残差、波前峰谷(PV)值、波前RMS、波前功率谱密度(PSD)等不同角度对高频相位的恢复效果进行了定量分析。在此基础上,对不同的畸变波前进行了高频相位的恢复,以验证该恢复算法的适应性。结果表明,运用逐次逼近迭代法,能有效地根据近场低频相位以及近场和远场光强分布恢复得到畸变波前的高频相位,进而可获得包括低频和高频相位在内的近场畸变波前信息,且该方法适用于不同畸变波前的高频相位恢复。The model of laser beam with distorted wavefront has been given,where the root-mean-square（RMS） gradient and the random phase perturbation have been introduced to describe the low and the high frequency phase distortions,respectively.According to the known low frequency phase in near-field,the intensity distribution in near-field and the intensity distribution in far-field,the successive iteration method has been proposed to recover the high frequency phase in near-field,and the recovery effect of high frequency phase has been analyzed quantitatively in the terms of the residual error,peak-valley（PV） value,RMS and power spectral density（PSD） of the wavefront.In addition,the adaptability of the retrieval method has been convinced by recovering different distorted wavefronts.The results show that the high frequency phase of distorted wavefront can be recovered effectively by using the successive iteration method,and the wavefront distortion including the low and the high frequency phases can be readily obtained.Furthermore,the successive iteration method is valid to recover different distorted wavefronts.

关 键 词：激光器 高频相位恢复 逐次逼近迭代法 相位校正 

分 类 号：O439[机械工程—光学工程]