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タイトル: Sub-10-fs population inversion in N2+ in air lasing through multiple state coupling
著者: Xu, Huailiang
Lötstedt, Erik
Iwasaki, Atsushi
Yamanouchi, Kaoru
キーワード: Physical sciences
Atomic and molecular physics
Optical physics
発行日: 2015年9月25日
出版者: Nature Publishing Group
掲載誌情報: Huailiang Xu, Erik Lötstedt, Atsushi Iwasaki, and Kaoru Yamanouchi, "Sub-10-fs population inversion in N2+ in air lasing through multiple state coupling", Nature Communications Online Edition: 2015/9/25 (Japan time), doi:10.1038/ncomms9347.
関連URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/mechanism-of-air-lasing.html
抄録: Laser filamentation generated when intense laser pulses propagate in air has been an attractive phenomenon having a variety of potential applications such as detection and spectroscopy of gases at far distant places. It was discovered recently that the filamentation in air induces ‘lasing’, showing that electronically excited N2+ is population-inverted, exhibiting marked contrast to the common understanding that molecular ions generated by intense laser fields are prepared mostly in their electronic ground states. Here, to clarify the mechanism of the population inversion, we adopt few-cycle laser pulses, and experimentally demonstrate that the lasing at 391 nm occurs instantaneously after N2+ is produced. Numerical simulations clarify that the population inversion is realized by the post-ionization couplings among the lowest three electronic states of N2+. Our results shed light on the controversy over the mechanism of the air lasing, and show that this post-ionization coupling can be a general mechanism of the atmospheric lasing.
内容記述: UTokyo Research掲載「レーザーが空気中で増幅される機構を解明」 URI: http://www.u-tokyo.ac.jp/ja/utokyo-research/research-news/mechanism-of-air-lasing.html
UTokyo Research "Mechanism of air lasing" URI: http://www.u-tokyo.ac.jp/en/utokyo-research/research-news/mechanism-of-air-lasing.html
URI: http://hdl.handle.net/2261/58564
ISSN: 2041-1723 (online)
出現カテゴリ:014 自然科学
1150910 学術雑誌論文


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