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Method and device improving laser beam focusing capacity

A technology of laser beams and capabilities, applied in optics, optical components, instruments, etc., can solve problems such as the inability to achieve global optimization and the inability to perfectly improve the focusing ability of laser beams

Active Publication Date: 2013-05-08
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The existing closed-loop control technologies are all proposed on the premise that the target light intensity distribution of the compensation laser beam is uniform by default. If there are modulation factors in the laser light intensity distribution, a single evaluation function setting will easily make the The closed-loop process enters the local optimal solution and cannot achieve the global optimal solution, so the focusing ability of the laser beam cannot be perfectly improved

Method used

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  • Method and device improving laser beam focusing capacity
  • Method and device improving laser beam focusing capacity
  • Method and device improving laser beam focusing capacity

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Effect test

Embodiment 1

[0037] A method for improving the focusing ability of a laser beam mainly includes the steps of:

[0038] S1. Extract the near-field light intensity distribution information of the laser beam, denoted as In(x,y);

[0039] S2. Calculate the far-field light intensity distribution information of the target through the amplitude optimization algorithm or other optimization algorithms in the prior art according to the near-field light intensity distribution information; the amplitude optimization algorithm can be Fourier iterative algorithm, gradient descent algorithm, random parallel gradient descent algorithm , simulated annealing algorithm or genetic algorithm, etc.; in this embodiment, the Fourier iterative algorithm is used as an example to illustrate, specifically:

[0040] According to the diffraction integral equation of wave optics or Fourier optics, the near-field light intensity distribution information can be obtained I n (x,y) and far-field light intensity distributio...

Embodiment 2

[0055] A device for improving the laser beam focusing ability of the method described in Embodiment 1, such as figure 1 As shown in: including wavefront controller 2, first beam splitter mirror 3, focusing mirror 6, second beam splitter mirror 7 and target material 9 arranged sequentially on the optical path of the laser beam; wavefront controller 2 is mainly used for Compensate the wavefront phase distortion of the laser beam, which can be a deformable mirror or a liquid crystal modulator or other known wavefront controllers. In this embodiment, it is preferably a deformable mirror. The deformable mirror mainly compensates the wavefront phase by changing its surface shape Distortion, and then change the far-field light intensity distribution of the laser beam; the function of the focusing mirror 4 is to form a focused spot of the laser beam on the target target 7; the first beam splitter 3 is mainly used to split the first sampling beam from the laser beam , the energy of the...

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Abstract

The invention relates to the technical field of laser beam control, in particular to a method and a device improving laser beam focusing capacity. The method comprises the steps of S1, extracting near field light distribution information of a laser beam, S2, calculating target far field light distribution information according to the near field light distribution information, S3, setting an evaluation function according to the target far field light distribution information, S4, extracting far field light distribution information, and S5, combining the evaluation function and the far field light distribution information to control far field light distribution in a closed-loop mode and improve the laser beam focusing capacity. According to the method and the device improving the laser beam focusing capacity, due to the adoption of the evaluation function which is more attached to an actual focusing limit, an optimal process of the laser beam focusing capacity is easier to control, the method and the device improving the laser beam focusing capacity is not prone to falling into a solved locally optimal solution, and therefore a better focusing character is capable of being obtained.

Description

technical field [0001] The invention relates to the technical field of laser beam control, in particular to a method and device for improving laser beam focusing ability. Background technique [0002] Since its appearance in 1960, laser has achieved unprecedented development. Due to its high brightness, good monochromaticity, good collimation and focusing performance, it has been widely used in scientific research, military defense, industrial processing, astronomical observation and information dissemination. Wide range of applications. [0003] In practical applications, due to the good focusing performance of the laser, it is easy to obtain a focused spot at the micron level or even at the nano level, so the focused laser beam is widely used in laser cutting, laser welding, laser drilling, laser marking and In operations such as laser medicine; in addition, ultra-high-power laser beams are focused and used in inertial confinement fusion. [0004] From the perspective of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/06G02B27/00G02B27/10
Inventor 巩马理邱运涛柳强黄磊闫平张海涛刘欢
Owner TSINGHUA UNIV
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