The present paper describes a novel implementation of the continuous phase shifting method (PSM), named heterodyne holography, in a scanning probe microscope configuration, able to retrieve the complex scattered field in on-axis configuration. This can be achieved by acquiring a continuous sequence of holograms at different wavelengths in just a single scan through the combination of scanning interference microscopy and a low-coherent signal acquired in the frequency domain. This method exploits the main advantages of the phase shifting technique and avoids some limits relative to off-axis holography in providing quantitative phase imaging.

中文翻译：

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扫描探针显微镜中的外差相移方法

本文介绍了一种新型的连续相移方法（PSM），称为外差全息术，它是在扫描探针显微镜配置下实现的，能够在同轴配置下检索复杂的散射场。这可以通过结合扫描干涉显微镜和在频域中获取的低相干信号，在单次扫描中获取不同波长的连续全息图序列来实现。该方法利用了相移技术的主要优点，并且在提供定量相位成像时避免了相对于离轴全息术的某些限制。