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首页> 外文期刊>Optics Communications: A Journal Devoted to the Rapid Publication of Short Contributions in the Field of Optics and Interaction of Light with Matter >Femtosecond and picosecond ultraviolet laser filaments in air: experiments and simulations
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Femtosecond and picosecond ultraviolet laser filaments in air: experiments and simulations

机译：空气中的飞秒和皮秒紫外激光灯丝：实验和模拟

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摘要

We report a study of the long-range self-guided propagation of intense femtosecond and picosecond UV laser pulses in air. Measurements of the laser beam profile along the propagation axis together with the ionization rate, the pulse temporal profile and power spectrum provide a comprehensive image of the UV filamentation process and its characteristics. Self-guiding is shown to subsist in both fs and ps cases, with a robust filament propagating over several meters in air. Stable filamentation is accompanied by an important restructuring of the pulse temporal profile. Complementary numerical simulations, using a three-dimension propagation code, are compared to the experimental results. The simulations reproduce most experimental observations, allowing for a better understanding of the phenomena involved in this unique propagation mode.
机译：我们报告了飞秒和皮秒级紫外线激光脉冲在空气中的远距离自导传播的研究。沿着传播轴的激光束轮廓的测量以及电离速率，脉冲时间轮廓和功率谱可提供UV丝化过程及其特性的全面图像。在fs和ps情况下，自导都存在，并且坚固的灯丝在空气中传播了几米。稳定的丝化伴随着脉冲时间轮廓的重要重组。使用三维传播代码的互补数值模拟与实验结果进行了比较。这些模拟重现了大多数实验观察结果，从而可以更好地了解这种独特的传播模式所涉及的现象。

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