The novel three-layer dielectric transmission grating under the Bragg incidence, which can be used as a polarizer, has been designed. According to the modal method, under the conditions of operating wavelength of 800 nm, duty cycle of 0.5 and period of 552 nm, the thickness of three grating layers can be roughly calculated. After that, the rigorous coupled-wave analysis method based on Maxwell’s theory is used to obtain more suitable grating parameter, which makes the grating diffraction efficiency higher. Under the Bragg incidence, the diffraction efficiencies of TE polarization in −1st order and TM polarization in 0th order can both exceed 96%. The novel three-layer grating has not only high diffraction efficiency but also the wide incident angle bandwidth. The optimized results show that the grating has good performance and good application value in the field of multi-channel laser device.

中文翻译：

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飞秒激光偏振器三层光栅的选择性分析

设计了布拉格入射下的新型三层介质传输光栅，该光栅可用作偏振片。根据模态方法，在工作波长为800 nm，占空比为0.5和周期为552 nm的条件下，可以粗略计算出三个光栅层的厚度。此后，采用基于麦克斯韦理论的严格耦合波分析方法获得更合适的光栅参数，使光栅的衍射效率更高。在布拉格入射下，-1阶的TE偏振和0阶的TM偏振的衍射效率都可以超过96％。新颖的三层光栅不仅具有高的衍射效率，而且具有宽的入射角带宽。