相干光照明的透镜成像系统离焦像场计算

Defocusing Image Field Calculation of Lens Imaging System Illuminated by Coherent Light

在相干光成像研究中,相干传递函数是考查相干光成像质量的基本依据。目前的相干传递函数是在特定的近似条件下定义的,因此,基于相干传递函数建立的单透镜系统成像公式只能近似计算像光场的振幅分布。像光场的振幅和相位是同等重要的物理量,对单透镜成像系统进行研究,建立了理想像及像平面附近像光场复振幅分布的准确计算公式,给出了离焦像场的振幅和相位分布的计算方法,并进行了实验验证。

In the study of coherent optical imaging, the coherent transfer function is the fundamental basis for investigating the imaging quality of coherent light. At present, the coherent transfer function is defined under a particular approximation condition. The imaging formula of single lens system has been created based on coherent transfer function, which can only approximately calculate the amplitude distribution of the image field. Nevertheless, amplitude and phase of the image field are of equal importance. In this paper, the single lens imaging system has been studied. An accurate formula for the complex amplitude distribution of the ideal image and the image field near the image plane is established. The calculation method for the amplitude and phase distribution of the defocussing image field is given. Finally, the relative experimental verifications are performed.