部分相干照明下的相位恢复方法及应用研究进展

Research Progress on Methods and Applications for Phase Reconstruction Under Partially Coherent Illumination

相位恢复技术在材料科学、生物医学、天文学等领域有着广泛的应用,不同的相位恢复技术及应用领域,需要用到不同的光源。光源的波长、相干性以及能量等参数都会影响最终的相位恢复效果。在以往的研究中,就空间相干性而言,往往将光源当作完全相干光处理,但是在实际应用中,X射线、电子束等光源都是部分相干光,且完全相干光经过介质时其空间相干性也会降低,因此,如何在部分相干照明下恢复物体正确的相位信息尤为重要。本文概述了空间部分相干照明下相位恢复技术的研究背景及研究进展,重点介绍了常用的几种相位恢复方法:模式分解法、强度传输方程、微扰法以及焦移法等,并对这些方法的优劣进行了对比分析。此外,还概述了微扰法相位恢复技术在特殊关联部分相干光场测量及部分相干涡旋光束拓扑荷数测量中的应用。

The phase reconstruction technique plays an extremely important role in various fields,such as materials science,biomedicine,and astronomy.In different phase retrieval technologies and applications,different light sources are needed.The wavelength,coherence,and energy of a light source can all affect the final phase reconstruction.In previous studies,in terms of spatial coherence,a light source has often been considered completely coherent light.However,in the actual experiments,X-ray and electron beams both correspond to partially coherent light.Spatial coherence of fully coherent light propagated through a medium will reduce accordingly.Therefore,it is especially important to identify appropriate ways to realize correct reconstruction under partially coherent illumination.In this paper,we provide a review of the research background and progress in developing phase reconstruction methods under partially coherent illumination.Some common methods,such as mode decomposition,transport of intensity equation,self-reference holography,and focus variation,are introduced and their advantages and disadvantages are compared.Moreover,the application of the self-reference holography method to the measurement of the correlation function for a specially correlated partially coherent beam and the determination of the corresponding topological charge of a partially coherent vortex beam is also summarized.