Polarization beam splitter, fundamental wave interference unit and comb splitter

Abstract

The invention provides a polarization beam splitting prism, a fundamental wave interference unit and a comb wave splitter. The prism includes a triangular prism and a quadrangular prism; wherein the cross section of the triangular prism is an isosceles right triangle; the cross section of the quadrangular prism is an isosceles trapezoid; the triangular prism Glue between the inclined surface of the triangular prism and one of the bottom surfaces of the quadrangular prism, and the inclined surface of the triangular prism or the bottom surface of the quadrangular prism is coated with a polarization splitting film; the bottom surface is the surface where the longer base of the isosceles trapezoid is located. Even in the case of multiple beams of parallel light incident, the parallel component of the incident light will eventually pass through the polarization beam splitting film twice, while the vertical component of the incident light will pass through the polarization beam splitting film once, ensuring that the vertical component of any set of light vectors and parallel The component has a fixed optical path difference to ensure the consistency of the optical path difference. With one device, the light phase difference of the vertical component and the parallel component can be changed at the same time and at the same time. It does not need to be adjusted separately, which is convenient for installation and debugging. Small and low cost.

Description

technical field [0001] The invention relates to optical communication technology, in particular to a polarization beam splitter, a fundamental wave interference unit and a comb wave splitter. Background technique [0002] Light is a transverse electromagnetic wave, and the light vector has the characteristic that the vibration direction and the propagation direction are perpendicular to each other; in the plane perpendicular to the light propagation direction, the light vibration direction is asymmetrical with respect to the light propagation direction, and this asymmetry leads to the light wave properties It changes with the direction of light vibration. People call this asymmetric property of the light vibration direction relative to the light propagation direction as the polarization characteristic of light. [0003] Taking advantage of the characteristic of polarization of light, it is widely used in communication technology, detection technology, development technology...

AI Technical Summary

Problems solved by technology

If the number of incident parallel lights increases, or the spacing is not equal, this phenomenon will be more obvious. Although most of the time it can be adjusted to realize the path of all the light passing through the p component in the vertical direction or the s component in the horizontal direction, this requires the production staff to deliberately To achieve this, it is necessary to use the naked eye and a photosensitive device to determine whether there is light passing alone image 3 The fifth surface S5 of the square prism 20 not only increases the production steps and wastes time, but also may not be observed because the incident light intensity is too weak or the wavelength band is special, which greatly increases the uncertainty

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