Device and method for shaping Gaussian beam to flat-topped beam

A flat-top beam and Gaussian beam technology, applied in the field of laser optics, can solve the problem of low flexibility

Inactive Publication Date: 2011-07-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the previous aspheric mirror shaping device, a group of aspheric mirrors can only shape the Gaussian beam with a specific beam waist radius, and the flexibility is not high. Therefore, we use a variable magnification beam expander group to expand the input Gaussian beam first. beam, and then input to the aspheric lens group

Method used

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  • Device and method for shaping Gaussian beam to flat-topped beam
  • Device and method for shaping Gaussian beam to flat-topped beam
  • Device and method for shaping Gaussian beam to flat-topped beam

Examples

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Embodiment 1

[0026] Such as figure 1 As shown, the device consists of four parts, which are variable power beam expander group, aspheric lens group, inverted fixed power beam expander group, and upright fixed power beam expander group;

[0027] The variable power beam expander group is composed of three lenses, which are plano-convex lens I1, plano-concave lens 2, and plano-convex lens II3;

[0028] The aspheric lens group is a Kepler-type beam expander or a Galileo-type beam expander. The Kepler-type aspheric mirror is composed of two plano-convex aspheric mirrors with different aspheric surface shapes. The Galileo-type aspheric mirror consists of one flat lens. Concave aspheric mirror and 1 plano-convex aspheric mirror;

[0029] The inverted fixed power beam expander lens group and the positive fixed power beam expander lens group are Kepler type beam expanders or Galileo type beam expanders, and the two types are arbitrarily matched.

[0030] The plano-convex lens I1, the plano-concave lens 2,...

Embodiment 2

[0034] Plano-convex lens I1, plano-concave lens 2, and plano-convex lens II3 constitute variable power beam expander group, concave lens 6, convex lens constitute upright fixed power beam expander group A, convex lens 9, concave lens constitute inverted fixed power beam expander group B, Plano-concave aspheric lens 10 and plano-convex aspheric lens III11 constitute a Galileo-type aspheric lens group. will figure 1 Replace the Kepler-type aspheric lens group in the with Galileo-type aspheric lens group, such as figure 2 As shown, other operating methods are the same as in Example 1.

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Abstract

The invention discloses a device and a method for shaping a Gaussian beam to a flat-topped beam. The device mainly comprises four parts, which are a variable focus beam expanding mirror group, an aspherical mirror group, an inverted fixed focus beam expanding mirror group and an upright fixed focus beam expanding mirror group sequentially. At the front end, the variable focus beam expanding mirror group is adopted for firstly performing beam expanding matching on the input Gaussian beam with arbitrary waist radius and the further inputting into the aspherical mirror group, thereby getting the flat-topped beam which is only applicable to near-field propagation. In order to get the flat-topped beam which has better beam quality and can be applicable to far-field propagation, the inverted fixed focus beam expanding mirror group is further used for performing beam expanding, beam reducing is further performed after far-field propagation for a certain distance, and then the flat-topped beam with good uniformity in light intensity distribution is obtained at the output end of a system. The device is very high in flexibility and good in controllability, and can perform the beam expanding on the Gaussian beam with the arbitrary waist radius, and simultaneously overcome the problem that the beam quality of the flat-topped beam which directly goes out of the aspherical mirror group becomes poor.

Description

Technical field [0001] The invention is a device and method for shaping a laser beam into a flat-top beam, which can shape a Gaussian beam with any waist spot radius within a certain aperture range into a flat-top beam. A variable power beam expander is used at the front end of the device to adjust the Gaussian beam. The beam is matched to the beam, and two sets of beam expanders are added to the rear end of the device, so that the flat-top beam can propagate in the far field without causing the beam quality to deteriorate. The device belongs to the field of laser optics. Background technique [0002] In many practical applications of lasers, such as laser holography, laser material processing, laser medical treatment, etc., laser beams with uniform light intensity spatial distribution are often required, and the beams directly from the laser are usually Gaussian beams, and for different lasers , The beam waist radius is not equal, so a laser beam shaping device is needed to sha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09
Inventor 陈檬陈凯李港
Owner BEIJING UNIV OF TECH
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