Ultrafast Spatiotemporal Dynamics of Terahertz Generation by Ionizing Two-Color Femtosecond Pulses in Gases
Ultrafast Spatiotemporal Dynamics of Terahertz Generation by Ionizing Two-Color Femtosecond Pulses in Gases
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DOI：
10.1103/physrevlett.105.053903
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发表时间：
2010-07-28
影响因子：
8.6
通讯作者：
Elsaesser, T.
中科院分区：
文献类型：
--
作者：
Babushkin, I.;Kuehn, W.;Elsaesser, T.
本文对双色电离激光脉冲在气体中产生太赫兹波的时空传输效应进行了理论和实验研究。所观察到的强烈增宽的太赫兹光谱与气体压力的增加揭示了突出的作用的时空重塑和等离子体诱导的泵浦脉冲的蓝移的产生过程中。从（3 + 1）维模拟得到的结果与实验结果吻合得很好，并澄清负责太赫兹发射的机制。
We present a combined theoretical and experimental study of spatiotemporal propagation effects in terahertz (THz) generation in gases using two-color ionizing laser pulses. The observed strong broadening of the THz spectra with increasing gas pressure reveals the prominent role of spatiotemporal reshaping and of a plasma-induced blueshift of the pump pulses in the generation process. Results obtained from (3 + 1)-dimensional simulations are in good agreement with experimental findings and clarify the mechanisms responsible for THz emission.