光栅衍射像的反差,位相和周期的分析

本文从理论上导出了相干光照明了菲涅耳衍射场中离开泰伯自成像平面时光栅像的反差、位相和周期的变化。得到了球面波和平面波照明下,光栅的傅里叶像生成的条件,从而定量地说明了泰伯效应与Lau效应的某种一致性。理论结果被实验验证。

Analysis on the contrast, phase and period of grating's diffraction image

In the Fresnel diffraction field, the variation of contrast, phase and period of the grating's image are derived theoretically in the plane offseted from the Talbot self-imaging plane under the coherent illumination. The image condition of Fourier image of the grating is obtained under the illumilation of spherical wave and plane wave. So that the coincidence to some extent between the Talbot effect and Lau effect is demonstrated quantitatively. The results of theory is coincident with that of experiment.