Remote generation of high-energy terahertz pulses from two-color femtosecond laser filamentation in air
Remote generation of high-energy terahertz pulses from two-color femtosecond laser filamentation in air
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DOI：
10.1103/physreva.83.053801
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发表时间：
2011-05
影响因子：
2.9
通讯作者：
Tie-Jun Wang;J. Daigle;S. Yuan;F. Théberge;M. Châteauneuf;J. Dubois;G. Roy;H. Zeng;S. Chin-S.-Ch
中科院分区：
文献类型：
--
作者：
Tie-Jun Wang;J. Daigle;S. Yuan;F. Théberge;M. Châteauneuf;J. Dubois;G. Roy;H. Zeng;S. Chin-S.-Ch
实验研究了空气中双色飞秒激光诱导成丝产生远端太赫兹（THz）的动态行为。通过优化泵浦参数，在16 m可控距离处测得频率低于5.5 THz的创纪录太赫兹脉冲能量570 nJ，超宽带太赫兹（<300 THz）脉冲能量高达2.8 {mu}J。提出了一种进一步的能量缩放可能性。通过同时分析灯丝中中性N{sub 2}和N{sub 2}{sup +}的荧光，我们发现太赫兹辐射的增强主要是由于第一个强基脉冲在灯丝内部引导弱二次谐波脉冲。
We experimentally investigated the dynamic behavior of remote terahertz (THz) generation from two-color femtosecond laser-induced filamentation in air. A record-high THz pulse energy of 570 nJ at frequency below 5.5 THz was measured by optimizing the pump parameters at a controllable remote distance of 16 m, while super-broadband THz (<300 THz) pulse energy was up to 2.8 {mu}J. A further energy-scaling possibility was proposed. By analyzing simultaneously the fluorescence from both neutral N{sub 2} and N{sub 2}{sup +} in the filament, we found that the enhancement of THz radiation was due principally to guiding of the weak second-harmonic pulse inside the filament of the first strong fundamental pulse.