Potential of Sub-THz-Wave Generation in Li2B4O7 Nonlinear Crystal at Room and Cryogenic Temperatures

Due to their high optical damage threshold, borate crystals can be used for the efficient nonlinear down-conversion of terawatt laser radiation into the terahertz (THz) frequency range of the electromagnetic spectrum. In this work, we carried out a thorough study of the terahertz optical properties...

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Autores principales:	Dmitry Ezhov, Snezhana Turgeneva, Nazar Nikolaev, Alexander Mamrashev, Sergei Mikerin, Fedor Minakov, Andrey Simanchuk, Valery Antsygin, Valery Svetlichnyi, Valery Losev, Yury Andreev
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	terahertz spectroscopy lithium tetraborate temperature dependence absorption coefficient refractive index down-conversion Crystallography QD901-999
Acceso en línea:	https://doaj.org/article/ed7dd4e7d9454b0d8e760753b14c5d8a
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spelling	oai:doaj.org-article:ed7dd4e7d9454b0d8e760753b14c5d8a2021-11-25T17:18:15ZPotential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures10.3390/cryst111113212073-4352https://doaj.org/article/ed7dd4e7d9454b0d8e760753b14c5d8a2021-10-01T00:00:00Zhttps://www.mdpi.com/2073-4352/11/11/1321https://doaj.org/toc/2073-4352Due to their high optical damage threshold, borate crystals can be used for the efficient nonlinear down-conversion of terawatt laser radiation into the terahertz (THz) frequency range of the electromagnetic spectrum. In this work, we carried out a thorough study of the terahertz optical properties of the lithium tetraborate crystal (Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>; LB4) at 295 and 77 K. Approximating the terahertz refractive index in the form of Sellmeier’s equations, we assessed the possibility of converting the radiation of widespread high-power laser sources with wavelengths of 1064 and 800 nm, as well as their second and third harmonics, into the THz range. It was found that four out of eight types of three-wave mixing processes are possible. The conditions for collinear phase matching were fulfilled only for the <i>o</i> − <i>e</i> → <i>o</i> type of interaction, while cooling the crystal to 77 K did not practically affect the phase-matching curves. However, a noticeable increase of birefringence in the THz range with cooling (from 0.12 to 0.16) led to an increase in the coherence length for <i>o − o</i> → <i>e</i> and <i>e</i> − <i>e</i> → <i>e</i> types of interaction, which are potentially attractive for the down-conversion of ultrashort laser pulses.Dmitry EzhovSnezhana TurgenevaNazar NikolaevAlexander MamrashevSergei MikerinFedor MinakovAndrey SimanchukValery AntsyginValery SvetlichnyiValery LosevYury AndreevMDPI AGarticleterahertz spectroscopylithium tetraboratetemperature dependenceabsorption coefficientrefractive indexdown-conversionCrystallographyQD901-999ENCrystals, Vol 11, Iss 1321, p 1321 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	terahertz spectroscopy lithium tetraborate temperature dependence absorption coefficient refractive index down-conversion Crystallography QD901-999
spellingShingle	terahertz spectroscopy lithium tetraborate temperature dependence absorption coefficient refractive index down-conversion Crystallography QD901-999 Dmitry Ezhov Snezhana Turgeneva Nazar Nikolaev Alexander Mamrashev Sergei Mikerin Fedor Minakov Andrey Simanchuk Valery Antsygin Valery Svetlichnyi Valery Losev Yury Andreev Potential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures
description	Due to their high optical damage threshold, borate crystals can be used for the efficient nonlinear down-conversion of terawatt laser radiation into the terahertz (THz) frequency range of the electromagnetic spectrum. In this work, we carried out a thorough study of the terahertz optical properties of the lithium tetraborate crystal (Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub>; LB4) at 295 and 77 K. Approximating the terahertz refractive index in the form of Sellmeier’s equations, we assessed the possibility of converting the radiation of widespread high-power laser sources with wavelengths of 1064 and 800 nm, as well as their second and third harmonics, into the THz range. It was found that four out of eight types of three-wave mixing processes are possible. The conditions for collinear phase matching were fulfilled only for the <i>o</i> − <i>e</i> → <i>o</i> type of interaction, while cooling the crystal to 77 K did not practically affect the phase-matching curves. However, a noticeable increase of birefringence in the THz range with cooling (from 0.12 to 0.16) led to an increase in the coherence length for <i>o − o</i> → <i>e</i> and <i>e</i> − <i>e</i> → <i>e</i> types of interaction, which are potentially attractive for the down-conversion of ultrashort laser pulses.
format	article
author	Dmitry Ezhov Snezhana Turgeneva Nazar Nikolaev Alexander Mamrashev Sergei Mikerin Fedor Minakov Andrey Simanchuk Valery Antsygin Valery Svetlichnyi Valery Losev Yury Andreev
author_facet	Dmitry Ezhov Snezhana Turgeneva Nazar Nikolaev Alexander Mamrashev Sergei Mikerin Fedor Minakov Andrey Simanchuk Valery Antsygin Valery Svetlichnyi Valery Losev Yury Andreev
author_sort	Dmitry Ezhov
title	Potential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures
title_short	Potential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures
title_full	Potential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures
title_fullStr	Potential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures
title_full_unstemmed	Potential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures
title_sort	potential of sub-thz-wave generation in li<sub>2</sub>b<sub>4</sub>o<sub>7</sub> nonlinear crystal at room and cryogenic temperatures
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ed7dd4e7d9454b0d8e760753b14c5d8a
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Potential of Sub-THz-Wave Generation in Li<sub>2</sub>B<sub>4</sub>O<sub>7</sub> Nonlinear Crystal at Room and Cryogenic Temperatures

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