We propose a method for retrieving a beam wavefront from its near-field intensity distribution after a 4f system by simply inserting a benchmark at the Fourier plane. Through a convolution of the mark-blocked spatial frequency component and the original optical field with the 4f system, the separation between the focus of any sub-aperture and the benchmark can be determined to reconstruct the beam wavefront. Theoretical and experimental studies demonstrate the validity of this method, which has potential applications in real-time wavefront sensing.

中文翻译：

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通过卷积空间光谱基准进行波束波前检索

我们提出了一种在 4f 系统后通过在傅立叶平面上简单地插入基准来从其近场强度分布中检索光束波前的方法。通过标记阻塞空间频率分量和原始光场与4f系统的卷积，可以确定任何子孔径的焦点与基准之间的间隔，以重建光束波前。理论和实验研究证明了该方法的有效性，在实时波前传感中具有潜在的应用价值。