Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr

We study supercontinuum generation with femtosecond mid-infrared laser pulses in NaCl and KBr crystals when pumped at the vicinity of their zero group velocity dispersion points. Almost three octave-spanning SC spectra (covering the 0.7–5.4 μm and 0.85–5.4 μm ranges in 5 mm-thick NaCl and KBr sample...

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Main Authors:	A. Marcinkevičiūtė, V. Jukna, R. Šuminas, N. Garejev, G. Tamošauskas, A. Dubietis
Format:	Article
Language:	English
Published:	Elsevier 2019-09-01
Series:	Results in Physics
Online Access:	http://www.sciencedirect.com/science/article/pii/S2211379719313841

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spelling	doaj-0ce3011b5cd04728ba14f4cb89b7b6a52020-11-25T01:20:35ZengElsevierResults in Physics2211-37972019-09-0114Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBrA. Marcinkevičiūtė0V. Jukna1R. Šuminas2N. Garejev3G. Tamošauskas4A. Dubietis5Laser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223 Vilnius, LithuaniaLaser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223 Vilnius, LithuaniaLaser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223 Vilnius, LithuaniaLaser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223 Vilnius, LithuaniaLaser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223 Vilnius, LithuaniaCorresponding author.; Laser Research Center, Vilnius University, Saulėtekio Avenue 10, LT-10223 Vilnius, LithuaniaWe study supercontinuum generation with femtosecond mid-infrared laser pulses in NaCl and KBr crystals when pumped at the vicinity of their zero group velocity dispersion points. Almost three octave-spanning SC spectra (covering the 0.7–5.4 μm and 0.85–5.4 μm ranges in 5 mm-thick NaCl and KBr samples, respectively) were produced by filamentation of 70 fs, 3.6 μm input pulses in continuously translated samples. In the static setup, we show that rapid formation of persistent color centers (within a few seconds at 500 Hz repetition rate) inside these materials results in a marked decrease (by 40%) of the overall energy transmittance and in significant narrowing of SC spectra. We also demonstrate that the effect of color centers on the SC spectrum could be adequately simulated numerically using a simple phenomenological model which considers color centers as impurities with a certain energy bandgap.http://www.sciencedirect.com/science/article/pii/S2211379719313841
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	A. Marcinkevičiūtė V. Jukna R. Šuminas N. Garejev G. Tamošauskas A. Dubietis
spellingShingle	A. Marcinkevičiūtė V. Jukna R. Šuminas N. Garejev G. Tamošauskas A. Dubietis Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr Results in Physics
author_facet	A. Marcinkevičiūtė V. Jukna R. Šuminas N. Garejev G. Tamošauskas A. Dubietis
author_sort	A. Marcinkevičiūtė
title	Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr
title_short	Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr
title_full	Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr
title_fullStr	Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr
title_full_unstemmed	Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr
title_sort	supercontinuum generation in the absence and in the presence of color centers in nacl and kbr
publisher	Elsevier
series	Results in Physics
issn	2211-3797
publishDate	2019-09-01
description	We study supercontinuum generation with femtosecond mid-infrared laser pulses in NaCl and KBr crystals when pumped at the vicinity of their zero group velocity dispersion points. Almost three octave-spanning SC spectra (covering the 0.7–5.4 μm and 0.85–5.4 μm ranges in 5 mm-thick NaCl and KBr samples, respectively) were produced by filamentation of 70 fs, 3.6 μm input pulses in continuously translated samples. In the static setup, we show that rapid formation of persistent color centers (within a few seconds at 500 Hz repetition rate) inside these materials results in a marked decrease (by 40%) of the overall energy transmittance and in significant narrowing of SC spectra. We also demonstrate that the effect of color centers on the SC spectrum could be adequately simulated numerically using a simple phenomenological model which considers color centers as impurities with a certain energy bandgap.
url	http://www.sciencedirect.com/science/article/pii/S2211379719313841
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Supercontinuum generation in the absence and in the presence of color centers in NaCl and KBr

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