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

Abstract

The invention discloses a liquid crystal optical phase shift detection system and method based on an interference method. The system is structurally characterized in that light emitted by a laser light source passes through a half-wave plate and then is divided into two beams of linearly polarized light by a first polarization splitting prism, wherein the polarization directions of the two beams of linearly polarized light are perpendicular to each other; one beam of linearly polarized light irradiates a liquid crystal optical phased array sample, is reflected by a first reflector and then enters a second polarization splitting prism; the other beam of linearly polarized light is reflected by the second reflector and then enters the second polarization splitting prism; and the second polarization splitting prism combines the two incident light beams, the combined light beam sequentially passes through a quarter-wave plate and a polarization analyzer and then irradiates the target surface of a charge coupling element, and the charge coupling element is connected with a computer control center. According to the invention, the absolute phase retardation of the sample is determined, high-precision, high-resolution, rapid and automatic detection of the two-dimensional liquid crystal phase shifter is realized, and the resolution and precision of phased array phase distribution detection are improved.

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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