Self-focusing and group-velocity dispersion of pulsed laser beams in the inhomogeneous atmosphere.
Self-focusing and group-velocity dispersion of pulsed laser beams in the inhomogeneous atmosphere.
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DOI：
10.1364/oe.26.014617
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发表时间：
2018-05
期刊：
影响因子：
3.8
通讯作者：
Yuqiu Zhang;X. Ji;Hao Zhang;Xiaoqing Li;Tao Wang;Huan Wang;Yu Deng
中科院分区：
文献类型：
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作者：
Yuqiu Zhang;X. Ji;Hao Zhang;Xiaoqing Li;Tao Wang;Huan Wang;Yu Deng
研究了非均匀大气中的自聚焦和群速度色散(GVD)效应对地面激光促进脉冲激光清除空间碎片的影响。结果表明，由于GVD效应和自聚焦效应的相互作用，脉冲宽度和束斑尺寸随传输距离的变化非常明显，这与线性情况下的情况有很大不同。结果表明，空间碎片上可能会出现时间脉冲分裂，空间旁瓣通常与时间脉冲分裂一起出现。与线性情况相比，碎片目标上的波束宽度和脉冲宽度都有所增加。此外，还推导了激光碎屑去除的修正焦距和M2因子的计算公式。结果表明，采用改进后的焦距，碎片靶上的光束质量较好，而M2因子小于1.6时，碎片靶上的光束质量较好。
We study self-focusing and group-velocity dispersion (GVD) effects in the inhomogeneous atmosphere on pulsed-laser space debris removal facilitated by a ground-based laser. It is found that changes of the pulse duration and the beam spot size with the propagation distance are noticeable due to the interplay of the GVD effect and the self-focusing effect, which is quite different from the behavior in the linear case. It is shown that the temporal pulse splitting may appear on the space debris, and the spatial side lobe usually appears together with the temporal pulse splitting. As compared with the linear case, the beam width and the pulse width on the debris target increase. On the other hand, crucial formulae of the modified focal length and the M2-factor for laser debris removal are also derived. It is found that the beam quality on the debris target becomes better if our modified focal length is adopted, and the beam quality on the debris target will be good if the value of M2-factor is less than 1.6.