数字显微全息中二次项相位误差的补偿

Compensation for the Quadratic Phase Aberration in Off-axis Digital Micro-holography

针对预放大式数字离轴显微全息技术中二次项相位误差,提出一种基于单幅全息再现的补偿方法.该方法是在显微物镜后焦平面处实现该相位误差的数学补偿,相位误差补偿过程具有调整参量单一化的优点.同时,利用显微物镜的后焦平面上物点特征实现了最佳再现距离的自动判断.该文以相位光栅为实验样本,对该方法进行了实验例证,实验结果验证了本文所提出二次项相位误差的补位误差的补偿方法的正确性和有效性.

A new method is presented to compensate the quadratic phase aberration introduced by Micro-Objective （MO） in Pre-magnified off-axis Digital Micro-Holography（DMH）. It can realize the numerical compensation for the quadratic phase aberration on the back focal plane of the MO. By using this method, one parameter only need to be adjusted numerically to compensate the phase aberration and also only one hologram is needed.And, the auto-calculation for the reconstruction distance is performed in term of the spectrum information characteristic of back focal plane of MO.The experimental example is presented with a phase grating used as a testing specimen. The experimental results validate the presented numerical compensation method right and validity. Some experimental conclusion and analysis are also given at last.