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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

<a href="/cs/project/LQ1606" target="_blank" >LQ1606: ELI Beamlines: Mezinárodní centrum Excelemce</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

New Journal of Physics

ISSN

1367-2630

e-ISSN

1367-2630

Svazek periodika

23

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

023035

Kód UT WoS článku

000620988900001

EID výsledku v databázi Scopus

2-s2.0-85101869889