3-光栅系统的干涉效应

本文用部份相干的观点提出并研究了三个独立光栅串联排列系统的干涉效应。用模糊函数导出了干涉条纹光强分布为三个光栅等效函数的联合卷积-相关积分。给出了条纹存在的光栅间距离和周期比条件。随光源光栅狭缝宽度的变化相应产生相干的Talbot效应、部份相干效应和非相干的Lau效应。部份相干条纹的波形随光栅的平移而变化。最后给出了实验验证。 关键词：

INTERFERENCE PHENOMENON ON A 3-GRATING SYSTEM

In this paper, the interference phenomenon in an optical system with three gratings in series arrangement is proposed and analysed in terms of the partial coherence theory and the ambiguity function. As a result, the fringe intensity distribution is derived as a joint convolution-correlation integral of three equivalent functions of gratings. The conditions on the distances and the period ratios between gratings are studied. With the change of the slit width, the Talbot effect, the partially coherent effect and the Lau effect can be observed in sequence. The profile of partially coherent fringes varies with the relative shift of any grating. Finally, experimental verifications for theoretical predictions are given.