Device and method for measuring deflection angles of polarized beam splitter (PBS) polarization membrane surfaces

Abstract

The invention relates to a device and a method for measuring deflection angles of polarized beam splitter (PBS) polarization membrane surfaces. The device comprises a tool support with a PBS bracket, a reflector arranged at the bottom of the tool support, a first two-dimensional pitching adjusting frame, a second two-dimensional pitching adjusting frame, an imaging mechanism which is arranged on the same light path as a PBS, and an image developing mechanism corresponding to the imaging mechanism, wherein the first two-dimensional pitching adjusting frame and the second two-dimensional pitching adjusting frame are arranged on the tool support and can respectively adjust angles of the reflector and the PBS. When incident light shoots at the imaging mechanism, the incident light can display a plurality of bright spots on the imaging mechanism through different light transmission paths of the imaging mechanism, the PBS and the reflector. A two-dimensional angle of the first two-dimensional pitching adjusting frame corresponding to the reflector can be adjusted to enable two brightest spots of the bright spots to be in superposition go obtain an inclination angle of the PBS membrane surface relative to the incident plane. The device and the method take processing errors into consideration, thereby improving measurement accuracy and quantification production efficiency of lasers.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to a device and method for measuring the plane deflection angle of a PBS polarizing film. Background technique [0002] PBS is the abbreviation of polarizing beam splitter. PBS is composed of two right-angle triangular prisms, and a polarizing film with a specific wavelength is coated on the glued surface of the two right-angle triangular prisms, so that the incident light can be divided into P light and S light respectively. to propagate. [0003] Under normal circumstances, the angle between the glued surface and the bottom surface of the prism is 45°. If the actual angle between the glued surface and the bottom surface of the prism deviates, the incident angle of the incident light relative to the glued surface is not within the Bruiser of the polarizing film. In terms of specific angles, this will inevitably greatly reduce the ratio of P light to S light after passing through ...

AI Technical Summary

Problems solved by technology

However, after the crystal is coated and glued, errors may be caused between the glued seams due to process and other problems, which makes the deflection angle change. The measured deflection angle between the PBS polarizing film surface and the bottom surface is not accurate.

When the deviation angle is very different, it will cause impurity in the polarization state of the polarized light, which will greatly affect the light quality of the laser. At the same time, it will also cause a deviation in pointing, which will greatly reduce the production efficiency in industrial laser production.

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