Liquid crystal optical phase shift detection system and detection method based on interferometry

Abstract

The invention discloses a liquid crystal optical phase-shift detection system and method based on an interference method. The system structure is as follows: the light emitted by a laser light source passes through a half-wave plate and is divided into two beams by a first polarization beam splitter prism. The polarization directions are perpendicular to each other. linearly polarized light; one beam of linearly polarized light is irradiated on the liquid crystal optical phased array sample, and then reflected by the first mirror and then injected into the second polarization beam splitter prism; the other beam of linearly polarized light is reflected by the second mirror Enter the second polarizing beam splitter; the second polarizing beam splitting prism combines the two beams of incident light, and irradiates the target surface of the charge-coupled element after the combined beam passes through the quarter-wave plate and the analyzer Above, the charge-coupled device is connected to the computer control center. The invention determines the absolute phase delay of the sample, realizes the high-precision, high-resolution, fast and automatic detection of the two-dimensional liquid crystal phase shifting device, and improves the resolution and precision of detecting the phase distribution of the phased array.

Description

technical field [0001] The invention belongs to the technical field of optical phase shift detection, in particular to a liquid crystal optical phase shift detection system and detection method based on an interference method. Background technique [0002] In liquid crystal optical phase shifting devices, especially in liquid crystal phase shifting array devices (for example: liquid crystal optical phased array), technical indicators such as maximum deflection angle, effective aperture, and pointing accuracy are directly related to the phase shifting of the device to the incident laser. relation. Therefore, the detection technology of liquid crystal optical phase shift can provide reliable detection means and basis for the further development of liquid crystal optical phase control devices. Among them: high resolution, high precision, and fast are the capabilities and technical indicators that the detection method or system needs to possess. The phase delay calculated by t...

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Problems solved by technology

[0006] The reference quantity changes with the temperature, thus, the phase delay obtained by the quarter-wave plate method is greatly reduced due to different references

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