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首页> 外文会议>2013 Conference on Lasers and Electro-Optics Europe amp; International Quantum Electronics Conference >THz generation by filamentation of two-color femtosecond laser pulses
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THz generation by filamentation of two-color femtosecond laser pulses

机译：通过双色飞秒激光脉冲的细丝产生太赫兹

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摘要

Terahertz (THz) sources have attracted an increasing interest for applications in time-domain spectroscopy and security screening for many years [1]. Recently, two-color laser filaments were reported to be efficient tools for the remote generation of THz radiation over long distances in gases [2]. Despite numerous experimental results, there is, however, no clear understanding of the dominant physical mechanism driving THz generation in filamentation regime, i.e., either rectification by four-wave mixing (FWM) or plasma currents generated by tunnel ionization. Here, we examine THz generation by two-color filamentation in argon by means of fully three-dimensional (3D) numerical simulations for different pump pulse energies, durations and central wavelengths. Evaluating the THz spectra from either Kerr or plasma sources reveals that photocurrents are dominant in THz generation during filamentation at clamping intensity. Our numerical results reproduce several experimental features, such as the growth of the THz yield with the pump pulse energy or with the pulse duration.
机译：多年以来，太赫兹（THz）光源对时域光谱学和安全性筛选的应用引起了越来越多的兴趣[1]。最近，据报道，双色激光灯丝是在气体中长距离远程产生太赫兹辐射的有效工具[2]。尽管有大量的实验结果，但是，对于细丝化过程中驱动THz产生的主要物理机制（即通过四波混合（FWM）进行整流或通过隧道电离产生的等离子体电流）尚不清楚。在这里，我们通过针对不同泵浦脉冲能量，持续时间和中心波长的完整三维（3D）数值模拟，研究了氩气中的两种颜色的细丝化产生的太赫兹。对来自Kerr或等离子体源的THz光谱进行评估后发现，在夹紧强度下的丝状化过程中，光电流在THz产生中占主导。我们的数值结果再现了几个实验特征，例如随着泵浦脉冲能量或脉冲持续时间而提高的THz产量。

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