Broadband prism multilayer film polarizing beam splitter
A polarization beam splitter and polarization beam splitting technology, applied in the field of optics, can solve the problems of the polarization beam splitter such as narrow polarization band, large number of polarizing film layers, and limited application range, and achieve high polarization extinction ratio and high refractive index , the effect of many layers
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[0024] figure 1 It is the working principle diagram of the prism multilayer film polarizing beam splitter in the prior art. it consists of two K 9 It consists of isosceles right-angle triangular prisms 1 and 2 of glass and a polarization beam splitting multilayer film 3 coated between them. The two internal angles of the isosceles right-angle triangular prisms 1 and 2 are all designed to be 45°, so the incident angle θ of the incident light 4 on the polarization beam splitting multilayer film 3 S =45°, for the convenience of optical path configuration, the transmitted p-polarized light 5 and the reflected s-polarized light 6 are designed to be perpendicular to each other. In order to satisfy the Brewster's angle condition, when the low refractive index film is preferentially used with a refractive index n L =1.38 MgF 2 Finally, the high refractive index film can only choose MgO, its refractive index n H =1.69. This polarizing beam splitter of the prior art has three obvi...
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