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A kind of optical diffraction simulation method and its device

A simulation method and optical technology, applied in the field of optical diffraction simulation, can solve problems such as inability to apply, obtain diffraction patterns of objects, bottlenecks, etc., and achieve simple structure, low cost, and high real-time performance

Active Publication Date: 2019-09-06
XIJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although computational methods for modeling optical diffraction have great advantages, there are also certain huge bottlenecks
For example, when the initial light field is unknown (or the transmittance function of the object is unknown), we cannot use computer simulation to obtain the diffraction pattern of the object

Method used

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  • A kind of optical diffraction simulation method and its device
  • A kind of optical diffraction simulation method and its device

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0024] If this device is used to obtain a wavelength of λ 1 , the diffraction pattern distribution at the diffraction distance Z. The implementation is as follows:

[0025] Step 1: Use λ 0 laser-illuminated objects.

[0026] Step 2: Move the sliding rail to adjust the diffraction distance between the detector and the diffraction object to make it equal to λ 1 Z / λ 0 .

[0027] Step 3: Record the diffraction pattern with the detector I 2 (x,y). According to Fresnel diffraction theory, I 1 ( x , y )= I 2 ( x , y ), which is to obtain the diffraction pattern distribution. (The diffraction pattern and the wavelength to be obtained are λ 1 , the diffraction distance is Z The distribution of the diffraction pattern is exactly the same). So far, the simulation process is completed.

[0028] Working principle of the present invention is:

[0029] I 1 ( x , y )= I 2 ( x , y ) proof of principle is as follows:

[0030] Diffraction light of different waveleng...

Embodiment 1

[0047] The experimental results of optical diffraction simulation using this device are as follows: figure 2 shown. figure 2 In the series of diagrams, 2a is the transmittance distribution of the diffractive object. Different gray levels in 2a represent different transmittances. The white distribution indicates that the area is completely transparent, and the black part indicates that the area is completely opaque. The lower the gray value, the worse the light transmittance here. The higher the gray value, the better the light transmittance here.

[0048] In this embodiment, a He-Ne laser is used as the illumination light source, and the wavelength of the He-Ne laser is 632.8 nm. figure 2 b is the diffraction pattern corresponding to the object with a diffraction distance of 356mm under the illumination of a green laser at 532nm. 2c is the diffraction pattern simulated by this device (He-Ne laser illumination, the diffraction distance is equal to 300mm). Compared figu...

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Abstract

The invention discloses a novel optical diffraction simulation method. The novel optical diffraction simulation method comprises steps that (1) lambda0 laser is emitted by a laser device, and is used for illumination of a diffraction object; (2) a slide rail is moved, and a diffraction distance z between a light intensity detector and the diffraction object is adjusted, and then z=lambda Z / lambda0; the lambda is a wavelength of a to-be-simulated light source, and Z is a to-be-simulated diffraction distance, and the lambda0 is the wavelength of the laser device; (3) a diffraction pattern is recorded by the light intensity detector, and is a diffraction pattern of a to-be-tested sample, when the wavelength of the to-be-simulated light source is lambda, and the diffraction distance is Z. The invention also discloses a novel optical diffraction simulation device. The novel optical diffraction simulation device comprises the laser device, a collimation beam expander, the to-be-tested sample, and the detector, which are sequentially and axially arranged. The to-be-tested sample is disposed on an object carrying bench, and parallel beams emitted by the laser device pass the to-be-tested sample vertically after being amplified by the collimation beam expander, and then are irradiated on the working surface of the detector. The detector is disposed on a movable platform by the slide rail provided with scale lines. When the diffraction object is unknown, a diffraction simulation process still can be completed.

Description

technical field [0001] The invention relates to the technical field of optical diffraction simulation, in particular to an optical diffraction simulation method and a device thereof. Background technique [0002] With the development of computer technology and the birth of the fast Fourier transform algorithm, people can accurately calculate the diffraction pattern of light of any wavelength at any distance when the initial light field is known. World-famous phase recovery algorithm [Opt. Lett. 3,27-29 (1978)], coherent diffraction imaging method [Opt. Express 22, 12513–12523 (2014), Optica 30, 9-14(2016), Nature 467, 436–439 (2010)] and digital holography [Opt. Lett. 31,1414-1416, (2006); Opt. Lett. 34, 250-252, (2009)] are based on the computer simulation of the diffraction process developed by technology. However, while the computational approach to modeling optical diffraction has great advantages, it also has certain huge bottlenecks. For example, when the initial li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/00
Inventor 李拓周晓华王娟刘丹刘辉
Owner XIJING UNIV