有限大小光栅的衍射分析

用稳相积分法分析了点光源经光栅光阑的衍射,得知加光阑对光栅的衍射虚像点的位置没有影响。将全息图置于有限大小平面透射光栅的衍射区域,并且满足全息图成消色散再现像条件时,白光中所有波长的色光都参与再现,形成白光消色散再现像。在有限大小平面透射光栅的衍射面上白光区域以外的区域将形成色光区域分布,将全息图置于该区域时,全息图再现像将呈现彩色。

The Fresnel Diffraction of the Grating Limited Size

The diffraction of with point light source illuminates the grating with square aperture analysised by mathod of stable phase.The location of the virtual image have not influenced that gained,when add the square aperture in front of the grating.When the hologram image was placed in the region of diffraction of plane transmission grating of limited size and achieve the ideal conditions of achromatic,all wavelength light-wave contained in white light that participated displaying and obtained displaying image of achromatic.The region of outside white light on the plane transmission grating of limited size where obtained color light region distribution.When the hologram image was placed that region,it displayed color image.