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Calibration device and method for lcos-based spatial light modulator

A technology of spatial light modulator and calibration device, which is applied in the field of optics, can solve problems such as low calibration accuracy, complex optical path, and complex calibration device, and achieve the effects of easier data acquisition, simple calibration device, and high calibration accuracy

Active Publication Date: 2022-02-18
GUANGXUN SCI & TECH WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with this dual-beam interference calibration method, the entire calibration device is complicated and the optical path is complicated, and the CCD fringe observation is not intuitive enough, and it is difficult to quantify, resulting in low calibration accuracy and slow calibration speed, which in turn affects the performance of the spatial light modulator.

Method used

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  • Calibration device and method for lcos-based spatial light modulator
  • Calibration device and method for lcos-based spatial light modulator
  • Calibration device and method for lcos-based spatial light modulator

Examples

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Embodiment 1

[0061] An embodiment of the present invention provides a calibration device for an LCOS-based spatial light modulator, such as figure 2 As shown, the spatial light modulator 110 includes an LCOS chip 106 and an SLM driving circuit 107, and the spatial light modulator 110 is a phase type SLM or an amplitude type SLM. For the above-mentioned spatial light modulator 110, the calibration device provided by the embodiment of the present invention includes a tunable laser 101, a circulator 102, a collimator 104 and a polarizer 105 connected in sequence before the LCOS chip 106, And a power meter 103 arranged behind the circulator 102 and a computer 108 are connected in sequence, and the computer 108 is connected to the SLM driving circuit 107 .

[0062] Based on the above calibration device, the calibration principle of SLM is as follows:

[0063] The outgoing light of the tunable laser 101 enters the collimator 104 after passing through the circulator 102, and then becomes linear...

Embodiment 2

[0071] On the basis of the above-mentioned embodiment 1, the embodiment of the present invention provides a method for calibrating an LCOS-based spatial light modulator, which is accomplished by using the calibration device described in embodiment 1. Wherein, before the SLM calibration is performed by the above-mentioned calibration device, it is necessary to determine the relevant parameter information of the spatial light modulator 110. The optical axis direction of the LCOS chip 106, the grayscale level of the SLM driving circuit 107, the applicable wavelength range of the spatial light modulator 110, and the like.

[0072] After determining whether the SLM is a phase type or an amplitude type, different algorithms for gamma calibration can be determined; after determining the optical axis direction of the liquid crystal molecules inside the LCOS chip 106, the polarizing direction of the polarizer 105 can be placed to be consistent with the liquid crystal inside the LCOS chi...

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Abstract

The present invention relates to the field of optical technology, in particular to a calibration device and method for an LCOS-based spatial light modulator. The calibration device includes a tunable laser, a circulator, a collimator, and a polarizer sequentially arranged before the LCOS chip. And a power meter and a computer are arranged sequentially after the circulator. The output light of the tunable laser enters the collimator after passing through the circulator, and then becomes linearly polarized light after passing through the polarizer and enters the LCOS chip; the light reflected by the LCOS chip enters into the Power meter, the optical power value is recorded by the power meter; the computer performs calculation and analysis based on the optical power value, and controls the SLM drive circuit to realize the calibration of the SLM according to the calculation result. The invention uses a power meter as a measuring device, the calibration device and the optical path are simpler, the data is easier to obtain, the calibration accuracy is higher, and a closed-loop system is formed to complete the SLM calibration fully automatically and quickly.

Description

【Technical field】 [0001] The invention relates to the field of optical technology, in particular to an LCOS-based calibration device and method for a spatial light modulator. 【Background technique】 [0002] Spatial Light Modulator (SLM for short) usually refers to a type of device that can load information on a one-dimensional or two-dimensional optical data field in order to effectively utilize the inherent speed, parallelism and interconnection capabilities of light. . Spatial light modulators can change the amplitude or intensity, phase, polarization state, and wavelength of spatial distribution under the control of time-varying electrical drive signals or other signals, or convert incoherent light into coherent light, and have been widely used in Optical information processing, beam transformation, output display and many other applications. [0003] At present, a relatively commonly used spatial light modulator is a spatial light modulator based on a Liquid Crystal on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13
CPCG02F1/1309
Inventor 王凡杨睿袁志林杨柳郭金平马雨虹杨宇翔禤颖仪
Owner GUANGXUN SCI & TECH WUHAN