为了得到数字全息图波前的准确重建场, 采用常见的波前重建算法进行实验研究和理论分析,得到了物光波通过非单一介质传播时的等效距离, 并利用该等效距离修改常用波面重建公式中的相关参量, 与柯林斯公式对数字全息图进行重建的结果进行比较分析, 发现当物光波通过非单一介质时, 采用等效距离修正的重建公式或者柯林斯公式均能得到准确的数字全息再现像。结果表明, 采用等效距离对数字全息图进行波前重建的结果与采用柯林斯公式重建的结果一致, 此方法能够简化光波通过非单一介质时对数字全息图的波前准确重建。该研究结果可为显微数字全息及数字全息检测应用提供有益的参考。

In order to obtain accurate wavefront reconstruction field of digital holography, theoretical analysis and experiments of common wavefront reconstruction algorithms were made. Equivalent distance of light wave propagating through single medium was obtained. The related parameters commonly used in wavefront reconstruction formula were modified by using equivalent distance. The results of reconstruction of digital hologram with Collins formula and with equivalent distance were compared and analyzed. It was found that when light passing through non single medium, accurate digital holographic image could be obtained by reconstruction formula using Collins formula or equivalent distance correction. The results show that the results of wavefront reconstruction using equivalent distance of digital hologram are consistent with the results obtained by Collins formula reconstruction. This method can be used to simplify wavefront reconstruction of digital hologram when light wave passes through single medium. The results provide useful reference for microscopic digital holography and application of digital holography detection.