Spectral splitting of the lasing emission of nitrogen ions pumped by 800-nm femtosecond laser pulses

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2FCZ______%3A_____%2F23%3AN0000023" target="_blank" >RIV/CZ______:_____/23:N0000023 - isvavai.cz</a>

Výsledek na webu

<a href="https://opg.optica.org/ol/fulltext.cfm?uri=ol-48-3-664&id=525491" target="_blank" >https://opg.optica.org/ol/fulltext.cfm?uri=ol-48-3-664&id=525491</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1364/OL.478025" target="_blank" >10.1364/OL.478025</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spectral splitting of the lasing emission of nitrogen ions pumped by 800-nm femtosecond laser pulses

Popis výsledku v původním jazyce

We report on a spectral splitting effect of the cavity-less lasing emission of nitrogen ions at 391.4 nm pumped by 800-nm femtosecond laser pulses. It was found that with the increase of the nitrogen gas pressure and pump pulse energy, both R and P branches experience spectral splitting. With an external injected seeding pulse, a similar split spectral line is observed for the amplified emission. In contrast, for the fluorescence radiation, no such spectral splitting phe-nomenon is observed with much more abundant R branch structures. Our theoretical model considers gas ionization by the pump pulse, the competition of excitation of all relevant electronic and vibrational states, and an amplification of the seeding pulse in the plasma with a population inversion. Our simulation reproduces this spectral splitting effect, which is attributed to the gain saturation resulting in the oscillation of the amplitude of the amplified signal.

Název v anglickém jazyce

Spectral splitting of the lasing emission of nitrogen ions pumped by 800-nm femtosecond laser pulses

Popis výsledku anglicky

We report on a spectral splitting effect of the cavity-less lasing emission of nitrogen ions at 391.4 nm pumped by 800-nm femtosecond laser pulses. It was found that with the increase of the nitrogen gas pressure and pump pulse energy, both R and P branches experience spectral splitting. With an external injected seeding pulse, a similar split spectral line is observed for the amplified emission. In contrast, for the fluorescence radiation, no such spectral splitting phe-nomenon is observed with much more abundant R branch structures. Our theoretical model considers gas ionization by the pump pulse, the competition of excitation of all relevant electronic and vibrational states, and an amplification of the seeding pulse in the plasma with a population inversion. Our simulation reproduces this spectral splitting effect, which is attributed to the gain saturation resulting in the oscillation of the amplitude of the amplified signal.

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

—

Návaznosti

V - Vyzkumna aktivita podporovana z jinych verejnych zdroju

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název periodika

Optics Letters

ISSN

0146-9592

e-ISSN

1539-4794

Svazek periodika

48

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

4

Strana od-do

664-667

Kód UT WoS článku

000964994300012

EID výsledku v databázi Scopus

2-s2.0-85147318288