Theory of femtosecond strong field ion excitation and subsequent lasing in N+2

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00548945" target="_blank" >RIV/68378271:_____/21:00548945 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11104/0325001" target="_blank" >http://hdl.handle.net/11104/0325001</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1367-2630/abd8bf" target="_blank" >10.1088/1367-2630/abd8bf</a>

Result language
angličtina
Original language name
Theory of femtosecond strong field ion excitation and subsequent lasing in N+2
Original language description
Delayed cavity-free forward lasing at the wavelengths of 391 and 428 nm was observed in recent experiments in air or pure nitrogen pumped with an intense femtosecond laser pulse at wavelength of 800 nm. The mechanism responsible for the lasing is highly controversial. In this article we propose a model explaining the delayed lasing, which contains two parts: (i) ionization of neutral nitrogen molecules and subsequent excitation of nitrogen ions in a strong pump laser pulse, and (ii) coherent emission of excited ions due to the presence of long-lived polarizations maintained by a weak laser post-pulse and coupling simultaneously ground state X2Σ+g to states A2Πu and B2Σ+u of singly ionized nitrogen molecules N+2 . Two regimes of signal amplification are identified: a signal of a few picosecond duration at low gas pressures and a short (sub-picosecond) signal at high gas pressures. The theoretical model compares favorably with results obtained by different
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/LQ1606" target="_blank" >LQ1606: ELI Beamlines: International Center of Excelence</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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