高功率激光在非均匀大气中传输的自聚焦效应研究进展

季小玲; 邓宇

doi:10.11884/HPLPB202133.210211

高功率激光在非均匀大气中传输的自聚焦效应研究进展

doi: 10.11884/HPLPB202133.210211

季小玲,
邓宇

四川师范大学物理与电子工程学院，成都 610068

基金项目: 国家自然科学基金项目（61775152, 61178070, 61475105）

详细信息

作者简介:
季小玲（1963—），女，博士，教授，主要从事激光传输与控制技术研究

中图分类号: O437.5
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-30
- 修回日期: 2021-08-10
- 网络出版日期: 2021-08-19
- 刊出日期: 2021-08-15

Research progress on self-focusing effect of high-power laser beams propagating in inhomogeneous atmosphere

Department of Physics, Sichuan Normal University, Chengdu 610068, China

摘要

摘要:
地基激光空间碎片清除和利用激光辐射把转换的太阳能从空间轨道输运到地面等应用中，不可避免地遇到高功率激光在非均匀大气中的传输问题。由于激光功率已远远超过大气非线性自聚焦临界功率，大气自聚焦效应是影响光束质量的一个重要物理因素。概述了近年来国内外高功率激光在非均匀大气中上行或下行传输的自聚焦效应研究进展，主要介绍了高功率激光在非均匀大气中的传输模型、理论基础、数值和解析研究方法，着重介绍了自聚焦效应对激光传输特性和光束质量的影响，并总结了优化靶面光束质量的方案。此外，还介绍了大气群速度色散效应和大气湍流效应等物理因素对激光光束质量的影响。最后，还提出了该领域值得进一步深入研究的一些问题。
- 高功率激光 /
- 非均匀大气 /
- 自聚焦效应 /
- 光束质量 /
- 光束传输特性 /
- 解析方法
Abstract:
The problem of high-power laser beams propagating through the atmosphere will be encountered in applications, such as the ground-based laser space-debris cleaning, and transportation of the laser radiation produced by solar power from space orbits to the ground. In such applications, the laser power is well above the critical power for self-focusing in air. Therefore, it is important to study the self-focusing effect of high-power laser beams propagating through the inhomogeneous atmosphere. This paper reviews the research progress on self-focusing effect of high-power laser beams propagating upwards or downwards in the inhomogeneous atmosphere. The laser beam propagation model, the theoretical model, and the numerical and analytical methods are introduced. The influence of the self-focusing on the beam propagation characteristics and the beam quality is introduced, and the methods of optimizing the beam quality on the target are summarized. Furthermore, the effects of group-velocity dispersion and atmospheric turbulence on the beam quality are also introduced. Finally, some interesting questions for further research are put forward.
- high-power laser beam /
- inhomogeneous atmosphere /
- self-focusing effect /
- beam quality /
- beam propagation characteristic /
- analytical method

HTML全文

图 1 高功率激光上行大气传输示意图^[24]

Figure 1. Diagram of high-power laser beam propagating upwards in atmosphere^[24]

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图 2 公式（4）的验证. 修正束宽w_mod在大气传输中随传输距离z的变化曲线. 虚线：公式（4）计算结果；实线：数值计算结果^[24]

Figure 2. Confirmation of Eq. (4). Modified beam width w_mod versus propagation distance z. Dashed curves: by Eq. (4); solid curves: by numerical simulation^[24]

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图 3 公式（7）的验证. 靶面束宽随相对发射功率P/P_crGs的变化^[25]

Figure 3. Confirmation of Eq. (7). Beam width w_tar ontarget versus relative power P/P_crGs^[25]

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图 4 光束宽度w随传输距离z的变化曲线. 虚线：自由空间中线性传输；实线：大气中非线性传输^[23]

Figure 4. Beam width w versus the propagation distance z. Dashed lines: linear propagation in free space; Solid lines: nonlinear propagation in the atmosphere^[23]

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图 5 相对脉宽T/T₀随传输距离z的变化^[21]

Figure 5. Relative pulse width T/T₀ versus propagation distance z^[21]

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图 6 环状光束光强分布I（x，y=0，z）随海拔高度z的变化^[33]

Figure 6. Intensity distributions I(x, y = 0, z) versus altitude z^[33]

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图 7 靶面上归一化光强I/I₀分布^[21]

Figure 7. Normalized intensity distributions I/I₀ on debris target^[21]

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图 8 光强轮廓I（r，z）随传输距离z的变化. 靶面均匀辐照^[22]

Figure 8. Intensity distribution I（r, z）versus propagation distance z. Uniform irradiation on debris target^[22]

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图 9 大气层出口处（a）光强分布I（r，z）和（b）相位分布Ф（r，z）；（c）靶面处相对光强I（r，z）/I_peak分布^[22]

Figure 9. (a) Intensity distribution I(r, z) and (b) phase distribution Ф(r, z) at the exit of the atmosphere, (c) relative intensity distribution I(r, z)/I_peak on the target^[22]

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图 10 地面处不同遮拦比ε的三维光强分布^[33]

Figure 10. Intensity distributions for different values of obscure ratio ε on ground^[33]

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图 11 预散焦前后靶面光强分布对比^[21]

Figure 11. Comparison of intensity distributions on debris target^[21]

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图 12 靶面束宽随透镜焦距F的变化^[25]

Figure 12. Beam width w_tar on target versus focal length F^[25]

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图 13 靶面束宽随波长的变化^[25]

Figure 13. Beam width on target versus wavelength λ^[25]

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图 14 最佳波长λ_opt随lg（C₀）和σ₀的变化^[25]

Figure 14. Optimal wavelength λ_opt versus lg（C₀) and σ₀^[25]

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图 15 相位分布$ \varPhi (x,y,{\textit{z}} ) $^[24]

Figure 15. Phase distribution $ \varPhi (x,y,{\textit{z}} ) $^[24]

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图 16 不同位置z处光强分布I（x，y，z）^[24]

Figure 16. Intensity distribution I(x, y, z) at different propagation distance z^[24]

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图 17 相位补偿后，不同位置z处光强分布I（x，y，z）^[24]

Figure 17. With PC, intensity distribution I(x, y, z) at different propagation distance z^[24]

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