波前传感揭示光学相干性
Wavefront sensing reveals optical coherence
摘要：
波前传感是一组提供有效手段来确定光学波前的形状或其与理想参考的偏差的技术。由于其宽的动态范围和高的光学效率，Shack-Hartmann是目前使用最广泛的传感器。在这里，我们表明，它实际上执行的入射辐射的位置和角谱的同时测量，因此，当与以前开发的用于量子信息处理的层析成像技术相结合时，Shack-Hartmann可以在重建信号的完整的相干特性。我们证实了这些预测与部分相干涡旋光束的实验表征，这种情况下，不能用标准工具处理。这似乎表明，迄今为止采用的传统方法没有充分利用登记数据的潜力。
英文摘要：
Wavefront sensing is a set of techniques providing efficient means to ascertain the shape of an optical wavefront or its deviation from an ideal reference. Due to its wide dynamical range and high optical efficiency, the Shack-Hartmann is nowadays the most widely used of these sensors. Here, we show that it actually performs a simultaneous measurement of position and angular spectrum of the incident radiation and, therefore, when combined with tomographic techniques previously developed for quantum information processing, the Shack-Hartmann can be instrumental in reconstructing the complete coherence properties of the signal. We confirm these predictions with an experimental characterization of partially coherent vortex beams, a case that cannot be treated with the standard tools. This seems to indicate that classical methods employed hitherto do not fully exploit the potential of the registered data.
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