针对在低相干离轴数字全息术中,光源相干长度限制物光波可探测面积的问题,提出了一种基于光程差扫描的低相干离轴数字全息记录方法.首先,通过改变参考光和物光波之间的光程差,使得干涉条纹扫描记录平面的不同区域,而后对各个区域的数字全息图采用数值再现的方法获取不同区域处的物光波相位分布,最后采用相位拼接技术拼接各个区域的相位分布实现物光波的全视场探测.

A recording method based on scanning the optical path difference was proposed in low coherence off-axis digital holography,due to the coherence length of the light source limit the detected area of the object wave.First,the different areas of detected plane were scaned by changing the optical path difference between the reference wave and the object wave.Then,the phase distribution of each scanning area was obtained by numerical reconstruction for each scanning area of digital hologram.At last,phase stitching technology was applied to stitch each scanning area to achieve the full field of the view of the object wave.