利用外接模块实现离轴多路复用全息的双波长同时相位展开
Simultanous two-wavelength phase unwrapping using external module for multiplexing off-axis holography
摘要：
我们提出了一个双波长的外部全息显微镜模块的定量相位成像的三维结构与扩展的厚度范围。这是通过同时获取两个离轴干涉图来完成的，每个离轴干涉图处于不同的波长，并且生成合成波长，该合成波长大于样品光学厚度，允许双波长展开。通过将两个干涉图光学多路复用到相机上来进行同时采集，其中每个干涉图相对于另一个干涉图具有正交的离轴干涉条纹方向。我们使用该系统对7.96 μ m台阶靶和30.5 μ m圆形铜柱进行定量成像。
英文摘要：
We present a dual-wavelength external holographic microscopy module for quantitative phase imaging of 3D structures with extended thickness range. This is done by simultaneous acquisition of two off-axis interferograms, each of which at a different wavelength, and generation of a synthetic wavelength, which is larger than the sample optical thickness, allowing two-wavelength unwrapping. The simultaneous acquisition is carried out by using optical multiplexing of the two interferograms onto the camera, where each of them has orthogonal off-axis interference fringe direction in relation to the other one. We used the system to quantitatively image a 7.96 um step target and 30.5 um circular copper pillars.
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