Broadband prism multilayer film polarizing beam splitter

Abstract

The invention discloses a broadband prism multilayer film polarizing beam splitter, which comprises a first prism, a second prism and a polarization beam splitting multilayer film. After incident light vertically enters from a first surface of the first prism, the incident light enters the polarization beam splitting multilayer film through being transmitted by a second face of the first prism and is divided into transmitted p-polarized light and reflected s-polarized light by the polarization beam splitting multilayer film, the p-polarized light exits after the p-polarized light is transmitted sequentially by a first face of the second prism and a second face of the second prism, the s-polarized light exits after the s-polarized light is transmitted sequentially by a second face of the first prism and a third face of the first prism, the light exiting from the second face of the second prism is vertical to the light exiting from the third face of the first prism, an included angle between the first surface of the first prism and the second face of the first prism is 52 degrees, an included angle between the second face of the first prism and the third face of the first prism is 65.6 to 77 degrees, and the index of refraction of the first prism and the second prism is 1.85-1.516. The polarizing beam splitter disclosed by the invention is not only simple to manufacture, but also has very broad polarization bandwidth and an excellent polarization extinction ratio.

Description

technical field [0001] The invention relates to a broadband prism multilayer film polarization beam splitter, which belongs to the field of optics and is mainly used in various optical, photoelectric and laser instruments such as LCoS helmets, liquid crystal projectors and polarizers. Background technique [0002] In various optical, photoelectric and laser instruments, prism multilayer film polarizing beam splitters have been widely used, for example, in LCoS helmets and liquid crystal projectors, because the electro-optic effect of liquid crystals is based on the modulation of polarized light In effect, the light incident on the liquid crystal modulation device must be polarized light with a high degree of polarization. [0003] The so-called prism multilayer film polarizing beam splitter is a polarizing multilayer film beam splitter coated between two prisms, which can completely transmit p-polarized light and reflect all s-polarized light, thereby realizing the polarizat...

AI Technical Summary

Problems solved by technology

In addition, due to the high polarizing beam splitting multilayer film and the small difference in refractive index of the low refractive index film material, this kind of polarizing beam splitter not only requires a large number of polarizing film layers and complicated processes, but more importantly, the polarization splitting The polarization band of the beamer is very narrow, only about 100nm, thus limiting its application range

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