Preparation method of liquid crystal polarization grating

Abstract

The invention discloses a preparation method of a liquid crystal polarization grating, belongs to the technical field of non-mechanical light beam deflection in active photoelectric systems, and mainly solves the problems that a current prepared optical path of the liquid crystal polarization grating is relatively complicated, is susceptible to external interferences, and has poor flexibility. According to the preparation method of the liquid crystal polarization grating provided by the invention, a wedge-shaped liquid crystal box is used for splitting incident lasers, and the polarization state of light beams is changed by utilizing a wave plate; after two beams of light interfere, a pattern in which the polarization direction changes linearly along with position is formed in a certain region, and finally, a photosensitive coating is irradiated to induce liquid crystal molecules to be oriented to prepare the liquid crystal polarization grating. An included angle between two beams of light after splitting is changed by controlling the magnitude of the voltage applied to the two sides of the wedge-shaped box, and the preparation of liquid crystal polarization gratings with differentperiods can be realized at the same time. The preparation method of the liquid crystal polarization grating provided by the invention is simple and reliable, low in cost, convenient and flexible, andis an ideal preparation scheme for the liquid crystal polarization grating engineering application.

Description

technical field [0001] The invention belongs to the technical field of non-mechanical light beam deflection in active photoelectric systems, and specifically refers to a method for preparing a liquid crystal polarization grating. Background technique [0002] Liquid crystal polarization grating is a new type of high-efficiency functional liquid crystal device. Its essence is to modulate the phase and polarization state of incident light by adjusting the spatial distribution of the liquid crystal optical axis. To a certain extent, it breaks through the performance limit of the original optical components. The most important feature of the liquid crystal polarization grating structure is that the photo-crosslinking reaction of the photosensitive material promotes the regular orientation of the liquid crystal molecules, and the optical axis of the liquid crystal molecules changes linearly in one-dimensional direction continuously and rotates 180° in one cycle. It is precisely ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing a liquid crystal polarization grating, which solves practical problems such as complex optical paths, high cost, poor flexibility, and difficulty in mass production in the preparation of current liquid crystal polarization gratings.

Images