Iwata Koichi, Satoh Kazuo, Moriwaki Kousuke
Lumino, 18-1, Daishi, Kawachi-Nagano, Osaka 586-0041, Japan. k‐
Appl Opt. 2012 Jun 1;51(16):3137-44. doi: 10.1364/AO.51.003137.
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.
我们可以用一个扩展光源，通过两个具有不同间距的光栅来形成一个光栅图像。这被称为广义光栅成像或塔尔博特-劳效应。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，两个光栅之间的间距是受限的。这对应于塔尔博特条件。在本文中，我们提议使用吸收光栅和相位光栅的组合来放宽间距限制。广义光栅成像理论被应用于具有这种光栅的系统。进行了模拟以计算对比度变化，结果表明所提出的系统实际上放宽了塔尔博特条件。一项实验验证了模拟结果。
