Wavelength Scaling of Terahertz Generation by Gas Ionization
Wavelength Scaling of Terahertz Generation by Gas Ionization
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DOI：
10.1103/physrevlett.110.253901
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发表时间：
2013-06-17
影响因子：
8.6
通讯作者：
Morandotti, Roberto
中科院分区：
文献类型：
--
作者：
Clerici, Matteo;Peccianti, Marco;Morandotti, Roberto
超短激光驱动电离产生的低频电流可以发射极宽的单周期太赫兹脉冲。我们提出了一个模型，预测一个很强的太赫兹辐射的波长依赖性与我们的实验研究。这表明，等离子体电流与泵浦波长的平方成比例地上升和波长依赖性聚焦条件的组合效应导致在1800 nm处的THz发射比800 nm波长高30倍。通过这种紧凑的桌面设置，可实现无与伦比的4.4 MV/cm单周期电场强度。
Low-frequency currents induced by ultrashort laser-driven ionization can emit extremely broadband, single-cycle terahertz pulses. We present a model that predicts a strong wavelength dependence of the THz emission in good agreement with our experimental study. This reveals that the combined effects of plasma currents rising proportionally to the square of the pump wavelength and wavelength-dependent focusing conditions lead to 30 times higher THz emission at 1800 nm compared to an 800 nm wavelength. Unrivaled single-cycle electric field strengths of 4.4 MV/cm are achieved with this compact table-top setup.