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首页> 外文会议>2017 Conference on Lasers and Electro-Optics Europe amp; European Quantum Electronics Conference >Optical lasing during laser filamentation in the nitrogen molecular ion: Ro-vibrational inversion
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Optical lasing during laser filamentation in the nitrogen molecular ion: Ro-vibrational inversion

机译：氮分子离子中激光细丝化过程中的光学激射：Ro振动反转

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Summary form only given. Inducing and controlling lasing in the open air is an intriguing challenge. Several recent experiments on laser filamentation in air have demonstrated generation of population inversion and lasing at the 391 nm and 428 nm lines in the nitrogen molecular ion [1-8], corresponding to transitions between the ground vibrational state of the second excited electronic state, B2Σu+, and the ground and first excited vibrational state of the ground electronic state, X2Σg+, see figure. Importantly, lasing at these transitions appears to be a very general effect, arising during filamentation of virtually any incident radiation, from visible to mid-infrared. We propose a mechanism that explains the population inversion between the B2Σ+u and X2Σ+g states based on the combined effect of several processes: (i) tunnel ionization of the neutral nitrogen molecule to the different relevant ionic states, using numerically calculated, angular-resolved strong-field ionization rates, (ii) laser-induced ultrafast electronic excitations in the ion, (iii) molecular vibrations, (iv) alignment of the molecule induced by the strong laser pulse, and (v) molecular rotation upon ionization.
机译：仅提供摘要表格。在户外诱导和控制激光发射是一个有趣的挑战。最近的几项关于空气中激光丝化的实验证明，在氮分子离子[1-8]中391 nm和428 nm谱线处会发生种群反转和激射，对应于第二激发电子态的基态振动态之间的跃迁， B 2 Σ u + ，以及基态电子态的基态和第一激发振动态X 2 Σ g + ，见图。重要的是，在这些跃迁处发射激光似乎是非常普遍的效果，实际上是在从可见光到中红外的几乎所有入射辐射的细丝化期间产生的。我们提出一种机制来解释B 2 Σ + u和X 2 Σ + < sub> g 状态基于多种过程的综合作用：（i）使用数值计算的角分辨强场电离速率将中性氮分子隧穿电离为不同的相关离子态，（ii）离子中激光诱导的超快电子激发，（iii）分子振动，（iv）强激光脉冲诱导的分子排列和（v）电离时分子旋转。

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