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基于薄膜法布里珀罗滤光片在其峰值波长处具有较大群延迟的特性,设计并从实验上验证了光束倾斜入射时这种结构中存在的超棱镜效应。根据光学薄膜理论中的特征矩阵法,数值模拟计算了器件的群延迟和空间色散曲线,镀制并对器件进行了测试。测试结果表明器件在透射峰值波长处因超棱镜效应引起的空间色散最大位移值达到65μm,与理论计算结果非常吻合;相对于传统的光栅和棱镜器件而言器件具有更高的空间角度色散,实际测试在784.5 nm至786.5 nm波长范围内器件的角色散达到30°/nm。
Due to the large group delay of the film Fabry-Perot filter at its peak wavelength, the super-prism effect in this structure is designed and experimentally verified. According to the characteristic matrix method of optical thin film theory, the group delay and spatial dispersion curve of the device were calculated by numerical simulation, and the device was plated and tested. The experimental results show that the maximum spatial dispersion of the device due to the super-prism effect at the transmission peak wavelength reaches 65μm, which is in good agreement with the theoretical calculation. Compared with the traditional grating and prism devices, the device has higher dispersion of spatial angle, Test the role of the device in the 784.5 nm to 786.5 nm wavelength dispersion up to 30 ° / nm.