GB/T 32831-2016 in English
VALIDQuality Evaluation and Testing Method of High Energy Laser Beam
- Issued on:2016-08-29
- Implemented on:2017-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 32831-2016高能激光光束质量评价与测试方法》由TC284（全国光辐射安全和激光设备标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
In-depth interpretation of high-energy laser beam quality evaluation and test methods
| Standard dimensions | Technical requirements | Scope of application | Comparative analysis |
|---|---|---|---|
| β factor | It is used to evaluate the ratio of the far-field divergence angle of the beam to the diffraction limit angle of the reference beam. The formula is: $$ \beta = \frac{\Theta_{u, \mathrm{real}}}{\Theta_{u, \mathrm{ref}}} $$ | It is applicable to the case where the far-field beam width is greater than the width corresponding to the diffraction limit angle. | The index calculation is simple and intuitive, but it is not sensitive to non-rotationally symmetric transmission characteristics. |
| BQ factor | The square root of the ratio of the power ratio of the reference beam to the measured beam in the barrel within the diffraction limit angle. The formula is: $$ \mathrm{BQ} = \sqrt{\frac{u_{\mathrm{ref}}}{u_{\mathrm{real}}}} $$ | Applicable to the case where the far-field beam width is close to the width corresponding to the diffraction limit angle. | It can reflect the uniformity of the beam energy distribution, but the calculation complexity is relatively high. |
| BPF factor | The ratio of the power ratio of the measured beam to the circular reference beam in the barrel within the diffraction limit angle. The formula is: $$ \mathrm{BPF} = \frac{u_{\mathrm{real}}}{u_{\mathrm{ref}}} $$ | Applicable to the test scenario of the circular reference beam. | The calculation is simple, but the applicability to non-Gaussian beams is low. |
| M matrix | Describes the transmission characteristics of the measured beam in the laboratory coordinate system, the formula is: $$ = \frac{\pi^2}{16\lambda^2} \begin{bmatrix} d_{0x}^2 \cdot \Theta_x^2 & d_{0xy}^2 \cdot \Theta_{xy}^2 \\ d_{0xy}^2 \cdot \Theta_{xy}^2 & d_{0y}^2 \cdot \Theta_y^2 \end{bmatrix} $$ | Applicable to the case where the measured beam has non-rotationally symmetric transmission characteristics. | Can fully reflect the transmission characteristics of the beam, but the calculation complexity is the highest. |
Practical Application Case Analysis
Case Background:A high-energy laser equipment manufacturer needs to test and optimize the laser beam quality.
Test Method Selection:Based on the characteristics of the equipment, two evaluation methods, BQ factor and M matrix, were selected. The BQ factor is used to evaluate the uniformity of the beam energy distribution, and the M matrix is used to analyze the transmission characteristics of the beam.
Test Results:The test results show that the BQ factor is 1.2, indicating that the beam energy distribution is uneven; the M matrix calculates the asymmetric transmission characteristics, indicating that the equipment needs to optimize the optical components to improve the beam quality.
Implementation Recommendations
- Test Device Calibration:Ensure that the response wavelength, linear dynamic range, and effective light diameter of the test device meet the standard requirements.
- Uncertainty assessment: Carry out uncertainty analysis on the test results according to the method specified in JJF1059.1-2012 to improve data reliability.
- Multi-dimensional evaluation: Select appropriate evaluation factors (β, BQ, BPF or M matrix) according to the actual application scenario to ensure that the beam quality characteristics are fully reflected.
- Technology evolution analysis: Pay attention to the latest developments in laser technology, regularly update test methods and standards, and maintain industry leadership.
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