Method for realizing Gaussian beam shaping and determining average radius of serrated aperture with random radius

A technology of average radius and Gaussian beams, applied in optics, optical components, instruments, etc., to achieve the effects of improving utilization, simple operation, and reducing light intensity contrast

Inactive Publication Date: 2014-07-02
BEIJING UNIV OF TECH
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Problems solved by technology

Therefore, the design of high-power lasers involves such a basic problem: under the premise of suppressing the beam Fresnel diffraction modulation and the resulting small-scale self-focusing, how to ensure the full use of the energy storage of the gain medium, that is, high fill factor

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  • Method for realizing Gaussian beam shaping and determining average radius of serrated aperture with random radius
  • Method for realizing Gaussian beam shaping and determining average radius of serrated aperture with random radius
  • Method for realizing Gaussian beam shaping and determining average radius of serrated aperture with random radius

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Embodiment Construction

[0024] The present invention is a method of laser cutting on a stainless steel sheet, cutting out such as image 3 The aperture of the shape shown is added to the laser light path of the Gaussian beam, and the light intensity distribution on the output optical axis and radial direction is measured. Then repeat the above operation with radius random sawtooth apertures with different average radii, compare their characteristic parameters respectively, and find out the optimal average radius, which also determines the radius random sawtooth to be used in the process of Gaussian beam shaping and uniformity The ratio of the mean radius of the stop to the beam width of a Gaussian beam. The working principle is as follows: the laser beam with a Gaussian distribution of light intensity has a low fill factor, and the fill factor can be increased by intercepting a certain range of energy through the aperture, but when using a circular aperture, due to Fresnel diffraction, the Points wi...

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Abstract

The invention relates to a method for realizing Gaussian beam shaping and determining average radius of a serrated aperture with random radius and belongs to the field of laser. The method comprises the following steps of: determining the radius r of the aperture, namely r=a*(1+a1*rand(theta)), wherein a is average radius and equal to 0.001 to 0.003 m and a1 is modulation depth and equal to 0.05; manufacturing the apertures with different average radiuses; performing tests and calculating characteristic parameters such as the filling factor, the modulation intensity and the optical intensity contrast; and determining the optimal average radius, wherein the obtained a is 60 percent of the width of the incident Gaussian beam. Compared with the traditional amplitude modulation ripple serrated aperture, the serrated aperture with the radius randomly changed along with the change of the angle is used together with a space filter, so that the radial beam filling factor is improved and the modulation intensity is reduced. The method can be widely applied to beam shaping and light intensity homogenization of a laser. By the method, the high filling factor can be achieved and the utilization ratio, the stability and the output power of the energy storage substances of the laser can be improved obviously.

Description

technical field [0001] The invention relates to a sawtooth aperture with a randomly changing radius, combined with a spatial filter, to realize shaping and homogenization of a Gaussian beam, and determine the optimal ratio of the average radius of the random sawtooth aperture to the beam width of a Gaussian beam to obtain The filling factor, modulation intensity and light intensity contrast are all superior to the light intensity distribution of the amplitude-modulated corrugated sawtooth diaphragm, and to a certain extent, the diffraction modulation of the light intensity on the axis is suppressed, and it belongs to the field of high-power laser manufacturing. Background technique [0002] In the beam intensity distribution of practically applied lasers, it is Gaussian or near-Gaussian in many cases, and there are few ideal plane waves. However, the light intensity of the Gaussian distribution will gradually weaken with the increase of the radius, and the energy less than a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/09
Inventor 李强王金国朱占达孙哲惠勇凌雷訇
Owner BEIJING UNIV OF TECH
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