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A device for measuring the quality of high-power continuous laser beams

A technology of laser beam quality and beam quality, which is applied in measurement devices, optical radiation measurement, photometry, etc., can solve the problems of inability to achieve rapid measurement, large attenuation factor required, and low withstand power density, and achieves simple structure, Fewer components and high power density

Active Publication Date: 2018-07-31
THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Beam quality M of high power CW laser compared to low power laser 2 The test is more difficult, if a CCD measuring device (M 2 -200s), due to its low power density, large attenuation multiple, complex test optical path, and many optical components, additional measurement optical path errors will be introduced; if the hollow probe method (FM120) that can withstand high power density is used, and Similar to the CCD measuring device, it needs to continuously move the spot measuring device (CCD or hollow probe) along the optical axis to collect the spot distribution, which takes a long time and cannot achieve fast measurement, which has certain limitations.

Method used

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  • A device for measuring the quality of high-power continuous laser beams
  • A device for measuring the quality of high-power continuous laser beams
  • A device for measuring the quality of high-power continuous laser beams

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] The laser to be tested is a collimated output fiber laser with an output power of about 1000W; the lens used is a plano-convex lens (fused silica), the focal length is f=502mm, and the peak power density of the focused spot is about 1MW / cm 2 Order of magnitude; the z-axis stroke of the multi-hollow probe spot measuring equipment is 200mm, so that the distance between the 100mm position of the guide rail and the plano-convex lens is about 500mm; the maximum measurement range of a single hollow probe is 8mm×8mm (a smaller test range can be selected) , the pixel selection is 64×64, and its maximum withstand power density is about 8MW / cm 2 .

[0067] use figure 1 The shown optical path builds the test device. First, the initialization settings are performed. The main parameters are to set the corresponding z-axis position of each hollow probe, the test range, rotation speed and sensitivity of each hollow probe, so as to ensure that it meets the test requirements: n test su...

Embodiment 2

[0075] Similar to Example 1, the laser to be tested remains the same, and the measurement method remains the same. In the measurement device, the focal length of the focusing lens is changed to f=800mm. After initialization, the d-z test data is tested:

[0076] Table 2 d-z test data record table

[0077] z / mm

[0078] Beam quality M obtained by data processing and polynomial fitting 2 =4.23.

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Abstract

The invention discloses a device for measuring the quality of a high-power continuous laser beam. The device comprises a focusing lens, a multi-hollow probe spot-measuring device and a data processing device. The focusing lens is used for converting a to-be-measured collimated beam into a focused beam and projecting the focused beam to a test area. The multi-hollow probe spot-measuring device is used for measuring the distribution of light spots in the test area. The data processing device is used for processing the distribution data of light spots so as to obtain the quality of the light beam. The multi-hollow probe spot-measuring device includes a plurality of hollow probes, a guide rail and a control circuit. The plurality of hollow probes are placed on the guide rail. The control circuit is used for controlling the operation of the hollow probes, so that the plurality of hollow probes are kept unchanged in position relative to one another during the high-speed rotating process. According to the technical scheme of the invention, the quality of the high-power continuous laser beam can be tested quickly, wherein the high-power continuous laser beam is in Gaussian distribution or in Gaussian-like distribution. Meanwhile, the device has the advantages of short test time, fewer optical elements, simple structure and easy implementation. The limitation problem during the quality test M2 of the high-power continuous laser beam in the prior art can be solved.

Description

technical field [0001] The invention belongs to the technical field of laser performance testing, and in particular relates to a device for measuring the quality of a high-power continuous laser beam, which is suitable for application in the high-power continuous laser field. Background technique [0002] Since the first laser came out in 1962, laser technology has developed rapidly and is changing with each passing day. Beam quality M 2 It is an important technical index to describe the characteristics of the laser, defined as the ratio of the beam waist divergence angle product of the actual beam to the beam waist divergence angle product of the ideal fundamental mode Gaussian beam: [0003] [0004] Among them, d 1 and θ 1 represent the beam waist width and far-field divergence angle of the actual beam, respectively, d 0 and θ 0 denote the beam waist width and far-field divergence angle of the ideal fundamental Gaussian mode, respectively, and [0005] The curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J1/00G01J1/04
CPCG01J1/00G01J1/0411
Inventor 唐仕旺宋祥姜永亮吕亮刘厚康胡金萌戴玉芬赵朋飞雷敏
Owner THE GENERAL DESIGNING INST OF HUBEI SPACE TECH ACAD