Terahertz control of air lasing
Terahertz control of air lasing
复制标题
DOI：
10.1103/physreva.99.053802
复制
发表时间：
2019-05
影响因子：
2.9
通讯作者：
M. Clerici;A. Bruhacs;D. Faccio;M. Peccianti;M. Spanner;A. Markov;B. Schmidt;T. Ozaki;F. Légaré-F.-Lé
中科院分区：
文献类型：
--
作者：
M. Clerici;A. Bruhacs;D. Faccio;M. Peccianti;M. Spanner;A. Markov;B. Schmidt;T. Ozaki;F. Légaré-F.-Lé
电离氮分子的相干辐射在遥感和天文学应用中具有重要意义。为了启动激光过程，我们使用了一个强烈的超短近红外（NIR）脉冲与太赫兹（THz）单周期脉冲重叠。我们观察到相干辐射可以被太赫兹场的振幅所播种和调制，这是有效的二阶非线性偏振和近红外泵浦引起的非线性效应相结合的结果。我们的结果揭示了强瞬态场在光激发气体分子相干辐射中的作用。
The coherent emission from ionized nitrogen molecules is of interest for remote sensing and astronomical applications. To initiate the lasing process, we used an intense ultrashort near-infrared (NIR) pulse overlapped with a terahertz (THz) single-cycle pulse. We observed that coherent emission could be seeded and modulated by the amplitude of the THz field, which is the result of a combined effective second-order nonlinear polarization and the nonlinear effects induced by the NIR pump. Our results shed light on the role of intense transient fields in the coherent emission from photoexcited gas molecules.