Phase-imaging techniques extract the optical path length information of a scene, whereas wavefront sensors provide the shape of an optical wavefront. Since these two applications have different technical requirements, they have developed their own specific technologies. Here we show how to perform phase imaging combining wavefront sampling using a reconfigurable spatial light modulator with a beam position detector. The result is a time-multiplexed detection scheme, capable of being shortened considerably by compressive sensing. This robust referenceless method does not require the phase-unwrapping algorithms demanded by conventional interferometry, and its lenslet-free nature removes trade-offs usually found in Shack–Hartmann sensors.

中文翻译：

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通过空间波前采样进行相位成像

相位成像技术提取场景的光路长度信息，而波前传感器提供光波前的形状。由于这两个应用程序具有不同的技术要求，因此他们开发了自己的特定技术。在这里，我们展示了如何使用具有光束位置检测器的可重构空间光调制器来执行结合波前采样的相位成像。结果是一个时分多路复用的检测方案，能够通过压缩感测大大缩短。这种强大的无参考方法不需要常规干涉测量法所要求的相位展开算法，并且其无小透镜的特性消除了通常在Shack-Hartmann传感器中发现的折衷方案。