Method for particle swarm design of shaping lens for converting Gaussian beam into flat-topped beam

A Gaussian beam, flat top beam technology, applied in optics, optical components, instruments, etc., to achieve the effect of pipeline production and simple processing technology

Active Publication Date: 2016-11-30
SHANDONG UNIV OF TECH
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Problems solved by technology

However, so far, the particle swarm optimization algorithm has not been introduced into the design of the beam shaping system. Therefore, combining the design of the beam shaping system with the particle swarm optimization algorithm makes the design of the beam shaping system more intelligent and procedural. has important practical significance

Method used

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  • Method for particle swarm design of shaping lens for converting Gaussian beam into flat-topped beam
  • Method for particle swarm design of shaping lens for converting Gaussian beam into flat-topped beam
  • Method for particle swarm design of shaping lens for converting Gaussian beam into flat-topped beam

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Embodiment 1

[0042] Suppose the one-dimensional light intensity distribution of the input Gaussian beam is ,make I 0 =1, Gaussian spot radius y 0 =7mm, the radiation intensity of the outgoing beam H=0.1, and the material used for the lens is SK2 glass with a refractive index of 1.601681 for red light.

[0043] Then described a kind of Gaussian beam is transformed into the particle swarm design method of flat-hat beam shaping lens and comprises steps as follows:

[0044] 1. The shaping system is a single aspherical lens, the front surface is a convex aspheric surface, and the rear surface is a plane, such as figure 1 shown. The equation of the aspheric surface is

[0045]

[0046] In the above formula is the off-axis height of any point on the aspheric surface, C is the curvature of the apex of the aspheric surface, is the quadratic surface coefficient, is the deformation coefficient of the aspheric surface.

[0047] Combining the aspheric parameters of the front surface of...

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Abstract

The invention discloses a method for designing a single aspheric surface shaping lens for converting a Gaussian beam into a flat-topped beam, namely a particle swarm optimization algorithm. Theoretical values of coordinates of an intersection of emergent light of the shaping lens and an output plane are obtained according to energy conservation before and after beam conversion, the theoretical values serve as target values, and actual values of the coordinates of the intersection of the emergent light of the shaping lens and the output plane are obtained according to the refraction law. Absolute values of differences of the actual values and the target values of plenty of light form evaluation functions of a beam shaping system, the evaluation functions serve as fitness functions in the particle swarm optimization algorithm, and structure parameters of the shaping lens are connected with the fitness functions in the particle swarm algorithm; the method for designing the beam shaping system through the particle swarm algorithm is provided, the design method is implemented through programming, and the design of the shaping system is procedural and intelligent. The invention further discloses a single aspheric lens for laser beam shaping based on the method.

Description

technical field [0001] The invention belongs to the technical field of non-imaging optics and laser beam shaping, in particular to a new method for designing an aspheric lens used for laser beam shaping. Background technique [0002] Flat-hat beams with uniform distribution of light intensity are widely used, such as laser cleaning, laser holography, laser medical treatment, laser shock hardening, inertial confinement fusion and other fields. At present, the methods for obtaining flat-hat beam mainly include: using special resonant cavity, laser medium gain saturation effect method, beam synthesis and beam shaping technology, etc., among which the simplest and most common method is the beam shaping method. [0003] Shaping techniques for shaping a Gaussian beam into a top-hat beam require the aid of a beam shaping system. The shaping methods that rely on the shaping system to obtain flat-hat beams, such as: the filter method with anti-Gaussian distribution of transmittance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/09G02B27/00
CPCG02B27/0012G02B27/0927G02B27/0955
Inventor 秦华张爽杨开刘珍李文瑞韩克祯
Owner SHANDONG UNIV OF TECH
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