High repetition rate green-pumped supercontinuum generation in calcium fluoride

Abstract We compare supercontinuum generation in $$\hbox {CaF}_2$$ CaF 2 crystal under tight and loose focusing of 150 fs, 515 nm second harmonic pulses from an amplified Yb:KGW laser at a repetition rate of 10 kHz. It is demonstrated that supercontinuum generation geometry applying loose focusing (...

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Autores principales:	Vaida Marčiulionytė, Vytautas Jukna, Gintaras Tamošauskas, Audrius Dubietis
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/89800c72f4064984afe12dcc9bc8330b
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spelling	oai:doaj.org-article:89800c72f4064984afe12dcc9bc8330b2021-12-02T16:17:17ZHigh repetition rate green-pumped supercontinuum generation in calcium fluoride10.1038/s41598-021-94411-12045-2322https://doaj.org/article/89800c72f4064984afe12dcc9bc8330b2021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94411-1https://doaj.org/toc/2045-2322Abstract We compare supercontinuum generation in $$\hbox {CaF}_2$$ CaF 2 crystal under tight and loose focusing of 150 fs, 515 nm second harmonic pulses from an amplified Yb:KGW laser at a repetition rate of 10 kHz. It is demonstrated that supercontinuum generation geometry applying loose focusing ( $$\hbox {NA}=0.004$$ NA = 0.004 ) of the pump beam into a long (25 mm) $$\hbox {CaF}_2$$ CaF 2 sample is advantageous in terms of supercontinuum spectral extent and durability of damage-free operation of the nonlinear material as compared to a commonly used supercontinuum generation setup which employs tight focusing ( $$\hbox {NA}=0.012$$ NA = 0.012 ) into a short (5 mm) sample and to setup which uses tight focusing into a long (25 mm) sample. More specifically, loose focusing into a long sample showed remarkably longer (20 min) damage-free operation of the nonlinear material, which was not translated with respect of the pump beam, while in tight focusing condition the sample is damaged just within 2 min of operation, leading to a complete extinction of the supercontinuum spectrum. The evolution of optical degradation of the nonlinear material in time and its impact to supercontinuum spectrum is studied in terms of filament-induced luminescence due to self-trapped exciton emission and light scattering at the pump wavelength indicating the onset of optical damage. Our findings are supported by the numerical simulations which compare relevant parameters related to filament propagation in tight and loose focusing conditions.Vaida MarčiulionytėVytautas JuknaGintaras TamošauskasAudrius DubietisNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Vaida Marčiulionytė Vytautas Jukna Gintaras Tamošauskas Audrius Dubietis High repetition rate green-pumped supercontinuum generation in calcium fluoride
description	Abstract We compare supercontinuum generation in $$\hbox {CaF}_2$$ CaF 2 crystal under tight and loose focusing of 150 fs, 515 nm second harmonic pulses from an amplified Yb:KGW laser at a repetition rate of 10 kHz. It is demonstrated that supercontinuum generation geometry applying loose focusing ( $$\hbox {NA}=0.004$$ NA = 0.004 ) of the pump beam into a long (25 mm) $$\hbox {CaF}_2$$ CaF 2 sample is advantageous in terms of supercontinuum spectral extent and durability of damage-free operation of the nonlinear material as compared to a commonly used supercontinuum generation setup which employs tight focusing ( $$\hbox {NA}=0.012$$ NA = 0.012 ) into a short (5 mm) sample and to setup which uses tight focusing into a long (25 mm) sample. More specifically, loose focusing into a long sample showed remarkably longer (20 min) damage-free operation of the nonlinear material, which was not translated with respect of the pump beam, while in tight focusing condition the sample is damaged just within 2 min of operation, leading to a complete extinction of the supercontinuum spectrum. The evolution of optical degradation of the nonlinear material in time and its impact to supercontinuum spectrum is studied in terms of filament-induced luminescence due to self-trapped exciton emission and light scattering at the pump wavelength indicating the onset of optical damage. Our findings are supported by the numerical simulations which compare relevant parameters related to filament propagation in tight and loose focusing conditions.
format	article
author	Vaida Marčiulionytė Vytautas Jukna Gintaras Tamošauskas Audrius Dubietis
author_facet	Vaida Marčiulionytė Vytautas Jukna Gintaras Tamošauskas Audrius Dubietis
author_sort	Vaida Marčiulionytė
title	High repetition rate green-pumped supercontinuum generation in calcium fluoride
title_short	High repetition rate green-pumped supercontinuum generation in calcium fluoride
title_full	High repetition rate green-pumped supercontinuum generation in calcium fluoride
title_fullStr	High repetition rate green-pumped supercontinuum generation in calcium fluoride
title_full_unstemmed	High repetition rate green-pumped supercontinuum generation in calcium fluoride
title_sort	high repetition rate green-pumped supercontinuum generation in calcium fluoride
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/89800c72f4064984afe12dcc9bc8330b
work_keys_str_mv	AT vaidamarciulionyte highrepetitionrategreenpumpedsupercontinuumgenerationincalciumfluoride AT vytautasjukna highrepetitionrategreenpumpedsupercontinuumgenerationincalciumfluoride AT gintarastamosauskas highrepetitionrategreenpumpedsupercontinuumgenerationincalciumfluoride AT audriusdubietis highrepetitionrategreenpumpedsupercontinuumgenerationincalciumfluoride
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High repetition rate green-pumped supercontinuum generation in calcium fluoride

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