Method and system for measuring spatial correlation structure of partially coherent light

A technology for measuring partial and coherent light, which is applied in measurement optics, measurement devices, optical radiation measurement, etc., and can solve problems such as large errors, long experiment time, and long time

Pending Publication Date: 2017-10-17
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above three types of methods all have their own advantages and disadvantages. The interferometric method can obtain the real part and the imaginary part of the complex coherence, but the sampling points are limited, and the more samples are taken, the longer the experimental process takes; the diffraction method

Method used

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  • Method and system for measuring spatial correlation structure of partially coherent light
  • Method and system for measuring spatial correlation structure of partially coherent light
  • Method and system for measuring spatial correlation structure of partially coherent light

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Embodiment 1

[0062] The method for measuring the spatial correlation structure of partially coherent light in this embodiment takes the measurement of a Laguerre-Gaussian correlated partially coherent laser beam as an example, and generates a Laguerre-Gaussian correlated partially coherent laser beam as the light source to be measured; photograph the light intensity of the light source; The light source is respectively reflected by the reflective spatial light modulator loaded and not loaded with disturbance, transmitted to the porous array, and the light intensity is photographed twice by the charge-coupled element placed at the Fourier plane; the computer processes the data. Described method specifically comprises:

[0063] Introduce disturbance to the light source to be measured, perform Fourier transform after outputting through the porous array structure, and record the light intensity transmitted from the light source to the Fourier plane;

[0064] No disturbance is introduced to the...

Embodiment 2

[0072] Such as figure 1 As shown, the system for measuring the spatial correlation structure of partially coherent light in this embodiment includes: a light source disturbance loading unit through which the light source to be measured passes sequentially, a porous array structure, an optical element for inverse Fourier transform of light intensity, a camera device, and a computer;

[0073]The light source disturbance loading unit includes an optical element that produces disturbance reflection to the light source, and an optical element that does not produce disturbance reflection to the light source; wherein the reflective optical element that produces disturbance to the light source is used to introduce disturbance to the light source to be tested and then reflect and output to the porous array Structure: an optical element that does not generate disturbed reflection to the light source, is used for not introducing disturbance to the light source to be tested, and reflects a...

Embodiment 3

[0104] The method for measuring the spatial correlation structure of partially coherent light in this embodiment takes the measurement of an unknown light source structure as an example.

[0105] The steps of measuring the correlation structure of the unknown light source: photographing the light intensity of the unknown light source to be measured; the light source to be measured is respectively reflected by the reflective spatial light modulator loaded and undisturbed, transmitted to the porous array and placed on the Fourier plane A charge-coupled device at 2 takes two shots of light intensity; a computer processes the data.

[0106] 1. The step of photographing the light intensity of the source field is: photographing the light intensity of the unknown light source 21 to be tested with a charge-coupled device.

[0107] 2. Record light intensity:

[0108] The light source to be measured is incident on the reflective phase-only spatial light modulator 23, and the light beam...

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Abstract

The invention relates to a method and system for measuring a spatial correlation structure of partially coherent light. The method comprises: disturbance is introduced into a to-be-measured light source, porous array structure outputting is carried out and then Fourier transform is carried out, and a light intensity of the light source transmitted to a Fourier plane is recorded; no disturbance is introduced into the to-be-measured light source, porous array structure outputting is carried out and then Fourier transform is carried out, a light intensity of the light source transmitted to a Fourier plane is recorded; inverse Fourier transform and screened array filtering are carried out on the light intensities recorded in disturbance and non-disturbance states, results after filtering are subtracted, and then an obtained result is transmitted to a light source plane in an inverse manner, so that a cross-spectral density function of the light source plane is obtained; and then according to a relationship between a correlation structure function, the cross-spectral density function, and a source field light intensity, a correlation structure of the light source is obtained. Therefore, complete real-part and virtual-part information of the spatial correlation structure of the to-be-measured light source can be obtained simultaneously.

Description

technical field [0001] The invention relates to a method and system for measuring the spatial correlation structure of partially coherent light. Background technique [0002] While the laser has high coherence, it will also introduce some noise, while the low coherence laser beam has unique advantages in many aspects, such as overcoming the speckle effect in nuclear fusion and increasing signal noise in atmospheric communication. Than wait. The most classic partially coherent laser beam is the Gauss-Scher mode beam, whose spatial correlation structure conforms to the Gaussian distribution. Based on the early research of F.Gori et al., a large number of models of partially coherent laser beams with special spatial correlation structures have been proposed , for example, a Laguerre-Gaussian correlated partially coherent laser beam, a Hermitian-Gaussian correlated partially coherent laser beam, and the like. Compared with the traditional Gauss-Scher mode partially coherent la...

Claims

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Application Information

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IPC IPC(8): G01J9/02
CPCG01J9/02G01J2009/0211G01J2009/0249
Inventor 赵承良曾军卢兴园朱新蕾刘磊鑫蔡阳健
Owner SUZHOU UNIV
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