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Method for stabilizing random drift of pulse laser beam

A technology of random drift and stable pulse, applied in lasers, laser parts, phonon exciters, etc., can solve the problems of adding new ones, and achieve the effect of easy operation, low cost and wide application range

Inactive Publication Date: 2012-03-07
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The shortcoming of prior art is: (1) mostly is the improvement on the hardware: add new element, device or change original material;

Method used

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  • Method for stabilizing random drift of pulse laser beam
  • Method for stabilizing random drift of pulse laser beam
  • Method for stabilizing random drift of pulse laser beam

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Such as figure 1 As shown, the specific steps of Embodiment 1 of the present invention are as follows:

[0037] In the absence of ground jitter, when only the random drift of the laser itself is considered in this example, the wavelength of the light source, the initial geometric parameters and the drift range of the random incident pulse are known: the wavelength of the light source is 632.8 nm, the beam propagation distance is 10 meters, and the position of the incident pulse drifts [ -0.1, 0.1] millimeters, pointing drift [-0.2, 0.2] milliradians, the number of pulses m in the pulse segment (m is a positive integer), m=2000 in this example;

[0038] Step 1 determines the number of pulse windows n and the number of pulses k (n, k is a positive integer, and n≤k≤m-1), in this example n=100, k=100;

[0039] Step 2 Calculate the moving average of the drift of the first 100 pulses according to the following formula of the moving average of the drift, and use this value as...

Embodiment 2

[0049] The concrete steps of embodiment 2 of the present invention are as follows:

[0050] Vibration from the ground can cause optical components to vibrate and also affect beam stability. In order to compare the influence of ground jitter on the correction beam pointing drift, the correction pattern after loading the ground turbulence is now considered. The loaded ground disturbance is set as a sinusoidal drift, such as image 3 shown;

[0051] Known light source wavelength, initial geometric parameters and random incident pulse drift range: light source wavelength 632.8 nm, beam propagation distance 10 meters, incident pulse position drift [-0.1, 0.1] mm, pointing drift [-0.2, 0.2] milliradians, pulse The number of pulses m in the segment (m is a positive integer), in this example m = 2000;

[0052] Step 1 determines the number of pulse windows n and the number of pulses k (n, k is a positive integer, and n≤k≤m-1), in this example n=100, k=100;

[0053] Step 2 Calculate t...

Embodiment 3

[0063] The concrete steps of embodiment 3 of the present invention are as follows:

[0064] In the absence of ground jitter, when only the random drift of the laser itself is considered in this example, the wavelength of the light source, the initial geometric parameters and the drift range of the random incident pulse are known: the wavelength of the light source is 325 nm, the beam propagation distance is 15 meters, and the position of the incident pulse drifts [ -0.2, 0.2] millimeters, pointing drift [-0.1, 0.1] milliradians, the number of pulses in the pulse segment m (m is a positive integer), m=5000 in this example;

[0065] Step 1 determines the number of pulse windows n and the number of pulses k (n, k is a positive integer, and n≤k≤m-1), in this example n=200; k=200;

[0066] Step 2 Calculate the moving average of the drift of the first 200 pulses according to the following formula of the moving average of the drift, and use this value as the first group of moving ave...

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Abstract

The invention relates to a method for stabilizing random drift of a pulse laser beam. The method is used for carrying out single pulse correction on the pulse laser beam on the basis of a drift quantity moving average (MA) principle and can be used for effectively stabilizing the laser beam in time and correcting the random drift. The method is crucially characterized in that: an appropriate drift quantity correction formula y(k)=Xi.y(k-1)+Eta.x(k) is proposed, wherein k is a pulse number, x(k) is the drift quantity of the kth pulse, y(k) is the correction quantity of the kth pulse, Xi is a coefficient value obtained by simulation optimization, and Eta is a parameter related to the self characteristic of a laser device; and the formula is used to realize closed-loop real-time correction for the laser beam drift. The invention provides a rapid and accurate measure for stabilization of the pulse laser beam and has broad application prospects in the fields of laser beam control, signal detection and the like.

Description

technical field [0001] The invention belongs to the field of light beam control and relates to a method for stabilizing the random drift of pulsed laser beams. Background technique [0002] Since the first ruby ​​laser came out in 1960, laser technology has been widely used in many fields of production, life and scientific research due to its advantages of good monochromaticity, good directionality, good stability, and high brightness. However, when the laser is working, due to the influence of many factors, the output beam will drift during the propagation process, which will affect the application of the laser in precision measurement and precision processing. The main sources of pulsed laser beam drift are as follows: (1) The light emitting mechanism of the laser itself will cause the beam to drift; (2) The random drift caused by the device and the ground shake; (3) The external transmission environment in the beam propagation path (surrounding Environmental temperature,...

Claims

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Application Information

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IPC IPC(8): H01S3/13
Inventor 张丽霞王瑞林林妩媚廖志杰张海波甘大春
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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