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Spatial light modulator modulation performance testing device and method based on 4F interference system

A technology of spatial light modulator and test space, applied in the direction of testing optical performance, etc., can solve the problem that the actual phase modulation amount of liquid crystal pixels deviates from the theoretical modulation amount, and the test and correction methods for mutual crosstalk between spatial light modulator pixels are less researched and affected. Holographic reproduction image quality and other issues to achieve the effect of improving quality

Active Publication Date: 2013-12-18
SHANGHAI UNIV
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Problems solved by technology

This interaction easily causes the actual phase modulation amount of the liquid crystal pixel to deviate from the theoretical modulation amount, which in turn leads to zero-order spots and conjugate images when the phase distribution of a given phase type is reproduced, which affects the quality of the holographic reconstruction image.
[0003] At present, there have been many research reports on the testing methods of the phase modulation characteristics of spatial light modulators at home and abroad, but there are few researches on the mechanism of crosstalk between pixels of spatial light modulators and its testing and correction methods, and further research is needed

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  • Spatial light modulator modulation performance testing device and method based on 4F interference system

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Embodiment Construction

[0016] The implementation of the technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings:

[0017] Such as figure 1 As shown, a test device for testing the modulation performance of a spatial light modulator based on a 4F interference system, including a laser 1, a polarizer 2, an objective lens 3, a pinhole 4, a lens 5, a beam splitting prism 6, and a reflective liquid crystal spatial light modulator 7 , reflecting mirror 8, first Fourier lens 9, second Fourier lens 10, CCD camera 11 and computer 12, it is characterized in that, described laser device 1 is fixed on the platform; Polarizer 2 is placed behind laser device 1, The objective lens 3 is placed behind the polarizer 2; the pinhole 4 for filtering is placed at the focal position of the objective lens 3, and at the same time at the focal position of the lens 5; the laser beam passes through the lens 5 to obtain a parallel beam; reflective liquid...

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Abstract

The invention discloses a spatial light modulator modulation performance testing device and method based on a 4F interference system. The testing device comprises a laser, a polarizing film, an objective lens, a needle hole, an optical lens, a beam splitter prism, a reflection-type liquid crystal spatial light modulator, a reflector, two Fourier lenses, a CCD camera and a computer. The two Fourier lens are combined to form the 4F interference system, and pixels of the spatial light modulator correspond to pixels of the CCD camera in a one-by-one mode. According to spatial light modulator modulation performance testing device and method, the phase modulation performance of the spatial light modulator can be tested, mutual crosstalk among pixels of the spatial light modulator can be tested, actual phase modulation amount of SLM pixels is measured after phase distribution with given loading phase types is carried out, the deviation between the actual phase modulation amount and a theoretical value is analyzed, the corresponding correction method is studied, the actual phase modulation amount of the SLM pixels meets the theoretical value, and accordingly the holographic photoelectric reproductive image quality is improved.

Description

technical field [0001] The invention relates to the field of testing the modulation performance of a spatial light modulator, in particular to a testing device and method for testing the modulation performance of a spatial light modulator based on a 4F interference system. Background technique [0002] The influence of spatial light modulators on the quality of holographic photoelectric reconstruction images is often the result of a combination of various factors. Comprehensive analysis of these influencing factors and a correction method are important prerequisites for obtaining high-quality holographic photoelectric reconstruction images. In the holographic photoelectric reproduction based on the phase modulation spatial light modulator, the modulation performance of the spatial light modulator to the incident light of different wavelengths is quite different. When it is difficult to achieve the ideal modulation state, it is often manifested as zero-order spots and con...

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Application Information

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IPC IPC(8): G01M11/02
Inventor 郑华东曾震湘于瀛洁卢小仟
Owner SHANGHAI UNIV
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