计算机模拟双层矩形位相光栅的实时变分束特征

双层矩形光栅随入射角的不同可得到不同数目的光束。基于这一现象，通过改变双层光栅的入射角，并对其进行优化就可得到效率高且光强分布均匀的光束。对利用双层矩形相位光栅实时变分束特征制作新型分束器的方法进行了理论探讨，并对2束、3束、4束光分束分别进行了分析。通过计算机模拟，从理论上求出了优化参数，并对结果进行了讨论。理论分析表明， 通过对入射角进行优化可以得到衍射效率高且光强分布均匀的分束器。该研究为制作方便实用、造价低廉的分束器提供了理论基础。

Computer Simulation of real time variational beam Feature of double deck rectangle phase grating

The light which goes through a double-deck rectangle phase grating with different incidence angles can produce different numbers of beams. Based on the phenomenon,the beam which has high efficiency and uniform distributed light intensity can be obtained by changing and optimizing the grating's incidence angle. The method of making a new type of splitter by the real-time variational beam feature of the double-deck rectangle phase grating was investigated theoretically. Two,three or four beams produced by the method were analyzed respectively. Through the simulation with a computer,the optimizing parameters of incidence angle were theoretically derived and the result was discussed. Theoretical analysis shows that the splitter with high diffraction efficiency and uniform distributed light intensity can be designed by incidence angle optimization. The study provides a theoretical basis for making practical and cheap splitting device.