Sub-bandgap laser-induced fluorescence in the CaF2 via a linear process

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F25%3A00616663" target="_blank" >RIV/61389013:_____/25:00616663 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/61389021:_____/25:00616663

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S0022231324005878?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022231324005878?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jlumin.2024.121023" target="_blank" >10.1016/j.jlumin.2024.121023</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Sub-bandgap laser-induced fluorescence in the CaF2 via a linear process

Popis výsledku v původním jazyce

Calcium fluoride (CaF2) is an excellent material for deep-ultraviolet optics. However, exposure to intense UV laser light can induce new defects in the material, a phenomenon known as laser-induced fluorescence (LIF). In our study, a femtosecond laser with a wavelength of 257 nm (4.82 eV, i.e., below CaF2 bandgap) was used to induce the LIF. We thoroughly studied the phenomenon behind the photoluminescence (PL) and its variation. Based on its linear excitation intensity dependence, we assigned the PL below 3.4 eV to sub-bandgap defect emission. The rate of LIF in this spectral region also scaled linearly with the irradiation pulse intensity. At the same time, the LIF rate was strongly dependent on the repetition rate. Our results suggest that laser-induced heating is responsible for the observed PL changes. We rationalized our observations based on the formation of F- and M-centres in CaF2.

Název v anglickém jazyce

Sub-bandgap laser-induced fluorescence in the CaF2 via a linear process

Popis výsledku anglicky

Calcium fluoride (CaF2) is an excellent material for deep-ultraviolet optics. However, exposure to intense UV laser light can induce new defects in the material, a phenomenon known as laser-induced fluorescence (LIF). In our study, a femtosecond laser with a wavelength of 257 nm (4.82 eV, i.e., below CaF2 bandgap) was used to induce the LIF. We thoroughly studied the phenomenon behind the photoluminescence (PL) and its variation. Based on its linear excitation intensity dependence, we assigned the PL below 3.4 eV to sub-bandgap defect emission. The rate of LIF in this spectral region also scaled linearly with the irradiation pulse intensity. At the same time, the LIF rate was strongly dependent on the repetition rate. Our results suggest that laser-induced heating is responsible for the observed PL changes. We rationalized our observations based on the formation of F- and M-centres in CaF2.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Journal of Luminescence

ISSN

0022-2313

e-ISSN

1872-7883

Svazek periodika

278

Číslo periodika v rámci svazku

March

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

8

Strana od-do

121023

Kód UT WoS článku

001386082200001

EID výsledku v databázi Scopus

2-s2.0-85211202388