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Method for realizing varifocal lens based on liquid crystal space optical modulator

A technology of spatial light modulator and liquid crystal, applied in the optical field, can solve problems such as the limitation of automatic zoom accuracy, and achieve the effect of improving the zoom response speed and the automatic zoom accuracy.

Inactive Publication Date: 2012-02-15
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology

Since this type of zoom lens involves mechanical positioning devices and moving parts, the automatic zoom accuracy and zoom response speed are limited by the control accuracy and response speed of the mechanical positioning device

Method used

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  • Method for realizing varifocal lens based on liquid crystal space optical modulator
  • Method for realizing varifocal lens based on liquid crystal space optical modulator
  • Method for realizing varifocal lens based on liquid crystal space optical modulator

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Embodiment 1

[0020] 1. The experimental principle of zoom lens based on LC-SLM:

[0021] In order to realize dynamic focusing based on liquid crystal materials, combined with computer graphics technology, the currently popular method of using the grayscale data of the grayscale image drawn by the computer to control the electrode voltage, and then control a single liquid crystal pixel. Using computer software, the phase modulation mode of the liquid crystal spatial light modulator is drawn in the form of grayscale to draw the annular structure of the Fresnel wave zone lens, and the effect similar to that of the Fresnel wave zone lens is obtained. That is to use the grayscale information of the image to control and generate the required modulation voltage signal, and then apply it to each pixel of the liquid crystal in a scanning manner. According to the phase modulation characteristics of the liquid crystal, each pixel performs phase modulation on the light wave irradiated on it.

[00...

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Abstract

The invention discloses a method for realizing varifocal lens based on a liquid crystal space optical modulator. The method comprises the following steps: according to the phase modulating principle of the liquid crystal space optical modulator, controlling the liquid crystal space optical modulator to modulate an incident light wave to generate a kinoform, diffracting the incident light wave into a converging spherical wave, and changing radius and zone number of a Fresnel zone plate in the kinoform to realize the variable focus of a program-control varifocus imaging system established by the liquid crystal space optical modulator. The method provided by the invention can be used for improving the automatic varifocus precision and the varifocus response speed of the varifocus imaging system, so that the focal distance of the lens is variable and easy to control.

Description

technical field [0001] The invention relates to the field of optics, in particular to a method for realizing a variable focus lens based on a liquid crystal spatial light modulator. Background technique [0002] Zoom imaging system (or zoom lens for short) is an important optical component, widely used in digital cameras, microscopes, telescopes and other precision optical and optoelectronic instruments and equipment. Traditional zoom lenses are usually composed of several groups of lens units with fixed focal lengths; the zoom process is realized by changing the relative positions of each lens unit. Since this type of zoom lens involves a mechanical positioning device and moving parts, the automatic zoom accuracy and zoom response speed are limited by the control accuracy and response speed of the mechanical positioning device. Contents of the invention [0003] The purpose of the present invention is to provide a method for implementing a zoom lens based on a liquid cr...

Claims

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Application Information

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IPC IPC(8): G02F1/133
Inventor 范君柳
Owner SUZHOU UNIV OF SCI & TECH
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