Method used for liquid crystal optical phase modulator phase detection

A phase modulator and phase detection technology, used in optical radiation measurement, instruments, optics, etc., can solve problems such as low accuracy, insufficient modulation range of the phase modulator, and insufficient processing algorithms.

Active Publication Date: 2013-05-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
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Problems solved by technology

Aiming at the deficiencies of existing phase modulators such as insufficient modulation range, low precision, and insufficient optimization of processing algorithms, the present invention adopts the following technical solutions:

Method used

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  • Method used for liquid crystal optical phase modulator phase detection
  • Method used for liquid crystal optical phase modulator phase detection
  • Method used for liquid crystal optical phase modulator phase detection

Examples

Experimental program
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Embodiment approach

[0027] step one:

[0028] Such as figure 1 Build a test system with a Michelson interferometer as the main optical path. The visible light emitted by the laser source passes through a polarizer and becomes linearly polarized light, and then passes through a filter to make the laser beam more uniform, and then splits the beam into two One path is the reference light, the other is the signal light path, the signal light path passes through the liquid crystal spatial optical phase modulator, the light path is adjusted, and the interference image can be obtained in the digital camera.

[0029] Step two:

[0030] Use a computer to control the drive circuit, control the LC-SLM drive voltage, and collect interference images with a digital camera to ensure that at least three frames of interference images are collected within the phase period of 2π.

[0031] Step three:

[0032] Using the inter-frame intensity correlation method to process the interference images collected by the...

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Abstract

The invention provides a new method used for liquid crystal optical phase modulator phase detection. A laser interferometer system is a main detection circuit for the method, the method comprises a laser device, a polarizer, a filter, the laser interferometer system and a digital camera. Lasers sent by the laser device become linearly polarized lights after passing a polarized film, then the filter enables laser emergent lights to become more equal, the lasers are divided into two ways, one way lasers are modulated by a liquid crystal optical phase modulator prepared to be tested, and the digital camera is used for collecting multiframe phase interference images. An interframe intensity correlation (IIC) matrix figuring interference strip images obtains phase changes of each frame interference image through least-squares iteration. The method has the advantages of being simple in a measuring system, low in requirements for phases and interference images, and high in accuracy.

Description

technical field [0001] The invention relates to the technical field of using a phase extraction method based on an inter-frame intensity correlation matrix model for phase detection of a liquid crystal spatial light phase modulator. Background technique [0002] Phase modulation is an important method in optical modulation methods, and is widely used in beam control, laser coherent combination, optical communication, photoelectric detection and other fields. In modern optical detection, it is often necessary to analyze and study interference fringes or interference patterns, extract phase information from them, and invert various physical properties of the measured target. The spatial optical phase modulator artificially controls the phase change of the output beam through specific physical effects. In adaptive optics systems, using liquid crystal spatial optical phase modulators instead of deformable mirrors for wavefront correction and reconstruction has attracted increas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J9/02G02F1/13
Inventor 岳慧敏胡泽雄宋雷吴雨祥刘永智刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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