Preparing method of electronic control Fresnel lens and based on Newton ring interference holographic record

Abstract

The invention relates to a preparing method of an electronic control Fresnel lens and based on Newton ring interference holographic record. According to the preparing method, light emitted by a laser device enters a Newton ring interference device after passing through a laser beam expander and permeating a beam splitter, light reflected by the upper surface and the lower surface of an air layer in the Newton ring interference device is interfered to form annular stripes, namely Newton rings, alternate with brightness and darkness, the Fresnel lens is then obtained after the annular interference stripes are reflected through the beam splitter and exposure is carried out on a polymer dispersed liquid crystal box, and the whole preparing process is a process of recording the Newton rings with the holographic method. According to the preparing method of the electronic control Fresnel lens and based on the Newton ring interference holographic record, the manufacturing technology is simple, the mask manufacturing process and the complicated photoetching process are avoided, manufacturing time is greatly shortened, and the efficiency of scientific researches and experiments is improved; the radius of a first dark ring of the Newton rings is controlled by adjusting a screw on the Newton ring interference device, and therefore polymer dispersed liquid crystal Fresnel lenses with different focal lengths can be manufactured; the optical diffraction characteristic of the Fresnel lens can be controlled by applying of external electric fields.

Description

technical field [0001] The invention relates to a diffraction optical element, in particular to a method for preparing a holographic polymer dispersed liquid crystal Fresnel lens whose optical diffraction characteristics can be controlled by an electric field. Background technique [0002] With the development of optical technology, people have higher and higher requirements for optical components. Electronically steered lenses are critical components for many applications such as optical signal processing, image processing, displays and optoelectronic devices. Liquid crystals, due to their unique electro-optic properties, are good candidates for electrically controlled switching devices such as liquid crystal lenses and liquid crystal gratings. As an electronically controlled photonic device, the advantages of liquid crystals are: high birefringence, low operating voltage, fast response time, high reliability, etc. Various electronically controlled liquid crystal lenses h...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems that the preparation method of Fresnel lens is complex, the Fresnel zone plate produced is expensive and time-consuming, and proposes an electronically controlled Fresnel lens preparation method based on holographic recording of Newton rings, with simple manufacturing process , and the electric field of the optical characteristics can be controlled, and the flexibility is strong

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