高能激光光束质量<i>β</i>因子的影响因素分析

王艳茹; 王建忠; 冉铮惠; 丁宇洁

doi:10.37188/CO.2020-0137

高能激光光束质量β因子的影响因素分析

doi: 10.37188/CO.2020-0137

中国工程物理研究院计量测试中心，四川绵阳 621900

基金项目: 国防科工局技术基础项目（No. JSJL2017212B002）

详细信息

作者简介:
王艳茹（1983—），女，陕西渭南人，博士，高级工程师，2011年于中国科学院光电技术研究所光学工程专业获得博士学位，目前主要从事光学计量与检测技术方面的研究工作。E-mail：wyr3235@163.com

王建忠（1974—），男，四川大邑人，硕士，高级工程师，分别于四川大学和电子科技大学获学士和硕士学位，主要从事无线电及光学计量测试技术研究。E-mail：WJLZ1999@sina.com

中图分类号: O438
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出版历程
- 收稿日期: 2020-07-27
- 修回日期: 2020-08-15
- 网络出版日期: 2021-02-05
- 刊出日期: 2021-03-23

Analysis of effects on the beam quality β factor of high power laser

Metrology and Testing Center, China Academy of Engineering Physics, Mianyang 621900, China

Funds: Supported by Basic Project of Science Technology and Industry for National Defense (No. JSJL2017212B002)

More Information

Corresponding author: WJLZ1999@sina.com

摘要

摘要: 采用二维线性调频z变换算法，分析了影响高能激光系统光束质量β因子测量准确性的因素。本文详细分析了采样点数（即衍射极限内的采样点数）和衍射光斑图像的能量损失率对光束质量β因子的影响。在衍射极限角直径2 (λ/D)范围内不同采样点数的模拟结果表明：采样点数越高，光斑衍射图像的分辨率越高，进而光束质量β因子计算越准确。在一倍衍射极限角2.44 (λ/D)范围内应最低不少于10个采样点，即可将β因子的测量误差控制在3%。同时，不同像差对光斑图像能量损失率的敏感程度不同，相同能量损失率下，高阶像差的β因子测量误差要高于低阶像差。特别是球差类的像差对能量损失最为敏感, 约5%的能量损失就可带来15%~30%的β因子计算误差。
- z变换 /
- 光束质量 /
- β因子 /
- 采样点数 /
- 能量损失
Abstract: The influencing factors of beam quality β factor of high-energy laser system is analyzed based on two-dimension chirp z transformation. The effects of the sampling number within the diffraction limit and the beam spot’s energy loss on the beam quality β factor are analyzed. The simulation results based on different sampling numbers indicate that a larger sampling number induces higher beam spot diffraction image resolution which is beneficial for more accurate calculation of a beam quality β factor. When the sampling number of the diffraction limit angle is no less than ten, the measurement error can be limited within 3%. Meanwhile, different wavefront aberrations have different sensitivities against beam spot energy loss. The beam quality β factor of high order wavefront aberration is larger than that of low order aberration with equal energy loss. Especially, the spherical aberration is most sensitive to energy loss, and about 5% energy loss can induce 15% to 30% calculation error of the β factor.
- chirp z transformation /
- beam quality /
- β factor /
- sampling number /
- energy loss

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图 1 基于不同采样点数的衍射光斑图像

Figure 1. The obtained diffraction beam figures based on different sampling numbers

下载: 全尺寸图片幻灯片

图 2 理想光束质量β因子随采样点数的变化规律

Figure 2. Beam quality β factor varies with sampling number of the ideal beam

下载: 全尺寸图片幻灯片

图 3 球差类像差对应的光束质量β因子随采样点数的变化规律

Figure 3. Variations of beam quality β with sampling number corresponding to the spherical, second-spherical and third-spherical wavefront aberrations

下载: 全尺寸图片幻灯片

图 4 球差像差A11对应的桶中功率（PIB）随采样点数的变化

Figure 4. Variations of power in bucket (PIB) with sampling number for the spherical wavefront aberration

下载: 全尺寸图片幻灯片

图 5 几种典型像差类型的PIB曲线和光束质量β因子值

Figure 5. PIB curves and beam quality β of several typical wavefront aberrations

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图 6 （a）离焦、（b）像散、（c）彗差和（d）初级球差对应的光束质量β因子测量误差与能量损失比的关系曲线

Figure 6. Relationship of measurement error curves of β factor with different energy losses corresponding to (a) the power, (b) the astigmatism, (c) the coma and (d) the spherical aberrations respectively

下载: 全尺寸图片幻灯片

图 7 不同像差的能量损失比与光束质量β因子的测量误差的关系

Figure 7. Relationship between measurement errors of β factor and energy loss ratios of different aberrations

下载: 全尺寸图片幻灯片

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