Polarized light beam splitting instrument

Abstract

The invention relates to a polarized light beam splitting instrument, comprising a right-angle prism and a polarized light beam splitter, wherein a first incident surface, a first fully reflecting surface, a second fully reflecting surface and a first exit surface are arranged on the right-angle prism; a second incident surface, a third reflecting surface, a fourth reflecting surface and a second exit surface are arranged on the polarized light beam splitter; the third reflecting surface is parallel to the fourth reflecting surface; a layer of polarized light beam splitting film is arranged on the third reflecting surface; and the first exit surface is optically jointed with the second incident surface. The beam splitting instrument can split two vertical polarization states of the incident rays and ensure the incident rays to exit in the direction opposite to the incident direction, and the reflected beams are parallel. Therefore, the beam splitting instrument can not only realize reflection but also split the reflected rays into two rays with polarization states vertical to each other. Besides, as the SP polarized light beam splitting film is adopted, the insertion loss of the polarized light beam splitting instrument is low.

Description

technical field [0001] The invention relates to a polarized beam splitter, in particular to a polarized beam splitter capable of reflecting along the original optical path. Background technique [0002] A polarizing beam splitter (PBS) is often employed to split the two polarization states of the light. A commonly used polarizing beam splitter (PBS) is a birefringent crystal, such as YVO 4 The crystal, through which the light can be split into two beams of different polarization states to exit, but this kind of polarization splitting device made of birefringent crystal cannot return the light path. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a polarizing beam splitter with a small volume, which can split the light into two beams of light whose polarization states are perpendicular to each other, and at the same time return the light path to overcome the existing technology. lack of. [0004] The present in...

AI Technical Summary

Problems solved by technology

A commonly used polarizing beam splitter (PBS) is a birefringent crystal, such as YVO 4 Crystal, the light can be split into two beams of different polarization states through the crystal, but this kind of polarization splitting device made of birefringent crystal cannot make the light path return

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