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Manufacturing method for serrated aperture with random radius

A production method and sawtooth technology, which are applied in the directions of optics, optical components, instruments, etc., to achieve the effect of easy engineering application and simple operation

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF TECH
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Problems solved by technology

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

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  • Manufacturing method for serrated aperture with random radius
  • Manufacturing method for serrated aperture with random radius
  • Manufacturing method for serrated aperture with random radius

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Embodiment Construction

[0022] The present invention is a method of laser cutting on a stainless steel sheet, cutting out such as figure 1 The aperture of the shape shown is added to the optical path of the plane wave laser, and the light intensity distribution on the output optical axis and radial direction is measured.

[0023] The working principle is as follows: After the laser passes through the aperture, the light intensity at any point is the sum of the wave packets at each point on the aperture area. When the edge of the aperture is a regular circle, due to Fresnel diffraction, the near The area at the edge has the same phase at the points on the axis, so constructive or destructive interference occurs, so there will be points on the axis with very strong light intensity, see Figure 5 , there will also be zero points, from Figure 8 It can also be seen that the light intensity fluctuates greatly in the center, which is easy to damage the laser working material. The amplitude modulation corr...

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Abstract

The invention relates to a manufacturing method for a serrated aperture with random radius and belongs to the field of laser. The method comprises the following steps of: generating a parameter, namely r=a*(1+a1*rand(theta)), of the serrated diaphragm with the radius randomly changed along with the increment of the angle, wherein a is average radius and equal to 0.002 m, a1 is modulation depth and equal to 0.05, and rand (theta) is a function randomly changed along with the change of the angle and equal to -1 to 1; and importing the parameter into computer-aided design (CAD) and cutting the corresponding aperture by a laser cutting method. Compared with the traditional amplitude modulation ripple serrated aperture, the serrated aperture with the radius randomly changed along with the change of 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, ensures the high filling factor of the laser, and remarkably improves the utilization ratio, stability and output power of the energy storage substances of the laser.

Description

technical field [0001] The present invention involves the use of a sawtooth aperture whose radius varies randomly with the change of angle, combined with a spatial filter, to obtain a radial light intensity distribution with a high filling factor and a low modulation intensity, and to a certain extent suppress the axial The invention relates to diffraction modulation of optical intensity, which belongs to the field of high-power laser manufacturing. Background technique [0002] Since the Sommerfeld wave packets at the edge of the circular hole have the same phase at all points on the axis, they will interfere constructively or destructively at the same time, resulting in a strong diffraction modulation of the light intensity on the axis, even if the small-scale self-focusing effect is not considered The strengthening effect on it will bring the damage problem of high-power laser itself. Therefore, in the design of high-power lasers, such a basic problem is involved: under ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B27/00
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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