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arXiv 1504.01893physics.optics
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飞秒laser激励引起的后向空气激光作用:population inversion寿命的影响

Backward air lasing actions induced by femtosecond laser filamentation: influence of population inversion lifetime

Hongqiang Xie, Guihua Li, Wei chu, Bin Zeng, Jinping Yao, Chenrui Jing, Ziting Li, Ya Cheng

摘要:

我们实验研究了使用800 nm飞秒激光脉冲在N2/Ar混合气体中产生后向357 nm N2激光,并基于泵浦-探测测量研究了所涉及的增益动力学。我们的研究结果表明,在激发的N2分子的粒子数反转的最小寿命所需的产生强烈的后向氮激光,这是在我们的实验条件下约0.8 ns。结果揭示了从环境空气中产生强后向激光的机制,这是高灵敏度遥感大气应用的高度需求。

英文摘要:

We experimentally investigate generation of backward 357 nm N2 laser in a gas mixture of N2/Ar using 800-nm femtosecond laser pulses, and examine the involved gain dynamics based on pump-probe measurements. Our findings show that a minimum lifetime of population inversion in the excited N2 molecules is required for generating intense backward nitrogen lasers, which is ~0.8 ns under our experimental conditions. The results shed new light on the mechanism for generating intense backward lasers from ambient air, which are highly in demand for high sensitivity remote atmospheric sensing application.

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