标题： 扩展物体的相干成像 显示英文标题

标题： Coherent imaging of extended objects

摘要： 当使用相干光时，即使为衍射受限的光学成像系统，由于其脉冲响应函数从一点到另一点缓慢变化（这一特性被称为非等光程性），本质上无法同时再现二维场分布的幅度和相位。 对于足够小的物体，这通常会导致相位失真，而对测量的强度没有影响。 在这里，我们表明，当成像大尺寸或特殊形状的物体时，强度分布也可能受到显著的失真。 我们使用两个简单的例子来说明这个问题：针孔相机和无像差的薄透镜。 我们理论分析预测的效果也通过实验观察得到了证实。 显示英文摘要

摘要： When used with coherent light, optical imaging systems, even diffraction-limited, are inherently unable to reproduce both the amplitude and the phase of a two-dimensional field distribution because their impulse response function varies slowly from point to point (a property known as non-isoplanatism). For sufficiently small objects, this usually results in a phase distortion and has no impact on the measured intensity. Here, we show that the intensity distribution can also be dramatically distorted when objects of large extension or of special shapes are imaged. We illustrate the problem using two simple examples: the pinhole camera and the aberration-free thin lens. The effects predicted by our theorical analysis are also confirmed by experimental observations.