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arXiv 1311.0992physics.optics
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强场电离产生的氮气等离子体通道的超辐射特征

Signature of superradiance from a nitrogen gas plasma channel produced by strong field ionization

Guihua Li, Chenrui Jing, Bin Zeng, Hongqiang Xie, Jinping Yao, Wei Chu, Jielei Ni, Haisu Zhang, Huailiang Xu, Ya Cheng, Zhizhan Xu

备注：
19 pages, 4 figures
发表信息：
Phys. Rev. A 89, 033833 (2014)
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摘要：

最近，Yao等人证明了用双色（800 nm + 400 nm）超快激光脉冲在氮气中产生相干发射[New J.Phys.15，023046（2013）]。基于这一双色方案，在这里，我们报告的时间特性的系统调查的相干发射在391 nm的实验研究其演变与增加的等离子体通道诱导的强烈的800 nm飞秒激光脉冲在氮气压力为~25毫巴。我们揭示了意想不到的时间轮廓的相干发射，这表明显着的超辐射签名由于量子相干性通过合作的合奏激发N2+分子。我们的研究结果揭示了强场电离分子诱导的类激光发射背后的机制。

英文摘要：

Recently, Yao et al. demonstrated the creation of coherent emissions in nitrogen gas with two-color (800 nm + 400 nm) ultrafast laser pulses [New J. Phys. 15, 023046 (2013)]. Based on this two-color scheme, here we report on systematic investigation of temporal characteristics of the coherent emission at 391 nm by experimentally examining its evolution with the increase of the plasma channel induced by the intense 800 nm femtosecond laser pulses at a nitrogen gas pressure of ~25 mbar. We reveal unexpected temporal profiles of the coherent emissions, which show significant superradiance signatures owing to the quantum coherence via cooperation of an ensemble of excited N2+ molecules. Our findings shed more light on the mechanisms behind the laser-like emissions induced by strong-field ionization of molecules.

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