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Relaxation of the Talbot condition in generalized grating imaging

机译:广义光栅成像中Talbot条件的松弛

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We can form a grating image with two gratings having different pitches with an extended light source. It is called generalized grating imaging or the Talbot-Lau effect. When we want to obtain high contrast image with pure absorption gratings or pure phase gratings, the separation between the two gratings is restricted. This corresponds to the Talbot condition. In this paper, we propose to use a combination of absorption grating and phase grating to relax the separation restriction. The theory of generalized grating imaging is applied to the system with this kind of grating. Simulations are performed for calculating contrast variation and show that the proposed system practically relaxes the Talbot condition. An experiment verifies the result of the simulation.
机译:我们可以在扩展光源的情况下,用两个间距不同的光栅形成一个光栅图像。这称为广义光栅成像或Talbot-Lau效应。当我们想用纯吸收光栅或纯相位光栅获得高对比度图像时,两个光栅之间的间隔受到限制。这对应于Talbot条件。在本文中,我们建议使用吸收光栅和相位光栅的组合来放松分离限制。广义光栅成像的理论被应用于具有这种光栅的系统。进行了计算对比度变化的仿真,结果表明所提出的系统实际上可以放松Talbot条件。实验验证了仿真结果。

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