A Method for Measuring All Parameters of One-Dimensional Liquid Crystal Grating

Abstract

The invention relates to a method for measuring all the parameters of a one-dimensional liquid crystal grating and belongs to the technical field of photoelectric measurement. According to the methodof the invention, a liquid crystal grating linear model is constructed, and a liquid crystal grating diffraction efficiency formula of Fraunhofer diffraction is obtained; a diffraction efficiency measuring device is used to measure 0-level, +1-level, and +2-order diffraction efficiency and diffraction angles under two wavelengths close to each other; an equation set containing liquid crystal grating parameters is constructed, and all the parameters of the liquid crystal grating are calculated; and calculation results are verified. The method of the invention has the advantages of simple measuring steps and non-destructive performance. According to the method, only the grating diffraction efficiency measuring device is adopted to measure the diffraction efficiency of the liquid crystal grating, so that all the parameters of the liquid crystal grating can be obtained. With the method adopted, measurement links for measuring a plurality of parameters of the liquid crystal grating can be decreased, measurement time for measuring all the parameters of the liquid crystal grating can be shortened, error sources can be effectively reduced, and final measurement results are verifiable.

Description

technical field [0001] The invention relates to a method for measuring all parameters of a one-dimensional liquid crystal grating, belonging to the technical field of photoelectric measurement. Background technique [0002] Liquid crystal grating is a kind of diffractive optical element based on liquid crystal birefringence effect, which is widely used in the fields of display, optical communication, optical information processing, adaptive optics and wavefront correction. Compared with traditional gratings, liquid crystal gratings can adjust the polarization state of incident light, and have the advantages of small size, low cost, and high accuracy of wavefront modulation. A one-dimensional liquid crystal grating refers to a liquid crystal grating with a periodic spatial structure in one dimension. The full parameters of the one-dimensional liquid crystal grating include grating constant, duty cycle, liquid crystal layer thickness, amplitude transmittance of two adjacent r...

AI Technical Summary

Problems solved by technology

[0004] Existing methods for measuring the parameters of one-dimensional liquid crystal gratings require a variety of measuring instruments or devices, and they all measure one or two parameters of one-dimensional liquid crystal gratings. The measurement steps are redundant, and some measurement methods are destructive. It is difficult to measure some specific parameters, and it is impossible to measure all the parameters of the one-dimensional liquid crystal grating at one time

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