Efficient polarization purifying device

Abstract

The invention provides an efficient polarization purifying device. The efficient polarization purifying device is composed of a wave plate heap, a quarter-wave plate and a reflector, wherein the wave plate heap is arranged obliquely, an Brewster angle is formed between the surface normal of the wave plate heap and the horizontal direction, then parallel light emitted by a laser can enter the wave plate heap with the Brewster angle, S polarized light is reflected, P polarized light is transmitted, and the quarter-wave plate is placed in the direction of S reflected light to enable the reflected S polarized light to shine on the quarter-wave plate vertically and the included angle between an optical axis and the horizontal direction to be 45 degrees; the reflector is placed behind the quarter-wave plate, the S polarized light is converted into the P polarized light after passing through the quarter-wave plate and the reflector, and then the P polarized light enters the wave plate heap with the Brewster angle. According to the efficient polarization purifying device, due to the fact that the reflector which is perpendicular to the wave plate heap is placed on the edge of the direction of emergent light formed after the reflected light passes through the wave plate heap, the emergent light is right in the horizontal direction; an extremely small number of elements are used, and single-direction-line polarized light with the high polarization degree, high polarization purity and high energy utilization rate is obtained.

Description

technical field [0001] The invention relates to the technical field of polarization conversion devices, in particular to a high-efficiency polarization purification device, which is a polarization conversion device with high polarization degree, high polarization purity and high conversion efficiency. Background technique [0002] The wave plate stack is composed of a group of parallel flat glass plates superimposed together. When the surface normal of the wave plate stack and the horizontal direction form the Brewster angle, when the natural light is horizontally incident and passes through the wave plate stack, the light passing through the wave plate stack The refracted light is continuously incident and refracted in the same state. Every time it passes through the interface, a part of the component (S component) that is perpendicular to the vibration of the paper surface is reflected from the refracted light, and finally the transmitted light passing through the wave plat...

AI Technical Summary

Problems solved by technology

There is no reflection loss when the light component vibrating parallel to the incident surface passes through the wave plate stack, while the light component vibrating perpendicular to the paper surface will produce up to 15% reflection loss, that is, the reflected light energy is not utilized, resulting in the transmitted light after passing through the wave plate stack. The energy is lower, and the number of waveplates must be increased if a high degree of polarization is to be obtained, resulting in higher cost

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