用于制作光纤光栅的Talbot干涉仪的分析与建模(英文)

Analysis and Simulation of Talbot Interferometer Used for Fabrication of Fiber Bragg Grating

对用于制作光纤光栅的Talbot干涉仪进行了分析 当考虑准分子激光器的空间相干性和时间相干性时 ,几何光学中的光线法并不能给出Talbot干涉仪干涉场的真实强度分布情况 ,而通过光的电磁理论 ,则可以提供对干涉场的详细描述 基于电磁理论 ,建立了一个Talbot干涉仪干涉场计算模型 ,并首次将Talbot干涉仪的反射镜转角作为模型计算参数加以考虑 ,随后进行了一系列的计算 计算结果显示了干涉场的分布 ,同时表明空间相干性对Talbot干涉仪的近场干涉和远场干涉影响都很大 ,其中远场干涉对空间相干性的要求更严格 ,且对于远场干涉 。

A Talbot interferometer used for fabrication of fiber Bragg grating is analyzed in this paper. As the light ray tracing method can not give the actual intensity distribution of interference field when spatial coherence and temporal coherence of excimer laser are taken into account, electromagnetic theory is used for the detail description of the near interference field and far interference field, and a computation model is established, which considering the turning angle of mirrors as a model parameter for the first time. With the model, a series of simulations are carried out. From the results of calculations, we obtained a more actual status of interference field. The results showed that spatial coherence had a large influence on fringe visibility of both near and far field interference, and the far field was stricter with spatial coherence. The effect of turning angles of mirrors on far field interference cannot be negligible.