Optical rotation reflector with reciprocal optical path characteristic

Abstract

The invention discloses an optical rotation reflector with a reciprocal light path characteristic. The optical rotation reflector comprises a steel tube, a first glass tube, a second glass tube, a collimator and an optical rotation assembly, blind holes are formed in the steel pipes; the first glass tube and the second glass tube are sequentially placed in the blind hole, and the first glass tube and the second glass tube are bonded into a whole; the collimator comprises a polarization-maintaining optical fiber pigtail and a spherical lens, and the polarization-maintaining optical fiber pigtail and the spherical lens are sequentially fixed in the first glass tube; the optical rotation assembly comprises a quarter-wave plate and a high-reflectivity mirror, the quarter-wave plate and the high-reflectivity mirror are sequentially fixed in the second glass tube, and the fast axis of the quarter-wave plate and the fast axis of the polarization-maintaining optical fiber pigtail form an included angle of 45 degrees. According to the invention, two beams of orthogonal line polarized light emitted from the polarization-maintaining optical fiber pigtail can pass through completely reciprocal light paths in the first glass tube and the second glass tube, and the polarization direction is rotated by 90 degrees during emission.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical rotation reflector with reciprocal optical path characteristics. Background technique [0002] Most of the existing optical rotation mirrors use the Faraday effect to achieve the optical rotation effect. [0003] However, the transmission paths of incident light with different polarization directions in existing optical rotation mirrors are not the same, so when it is applied to fully polarization-maintaining linear Sagnac interference structures such as In-line Sagnac interferometers, it cannot be used for propagation in the preservation The light of the fast axis and the slow axis of the polarization fiber provides a reciprocal optical path, which will cause an additional phase difference error between the two beams of light, thereby reducing the detection effect of the high-precision sensing system. [0004] Therefore, it is an urgent problem for thos...

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Problems solved by technology

[0003] However, the transmission paths of incident light with different polarization directions in existing optical rotation mirrors are not the same, so when it is applied to fully polarization-maintaining linear Sagnac interference structures such as In-line Sagnac interferometers, it cannot be used for propagation in the preservation The light of the fast axis and the slow axis of the polarization fiber provides a reciprocal optical path, which will cause an additional phase difference error between the two beams of light, thereby reducing the detection effect of the high-precision sensing system

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