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Potential of sub-THz-wave generation in Li2B4O7 nonlinear crystal at room and cryogenic temperatures. / Ezhov, Dmitry; Turgeneva, Snezhana; Nikolaev, Nazar et al.
In: Crystals, Vol. 11, No. 11, 1321, 11.2021.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Potential of sub-THz-wave generation in Li2B4O7 nonlinear crystal at room and cryogenic temperatures
AU - Ezhov, Dmitry
AU - Turgeneva, Snezhana
AU - Nikolaev, Nazar
AU - Mamrashev, Alexander
AU - Mikerin, Sergei
AU - Minakov, Fedor
AU - Simanchuk, Andrey
AU - Antsygin, Valery
AU - Svetlichnyi, Valery
AU - Losev, Valery
AU - Andreev, Yury
N1 - Funding Information: Funding: The research was funded by the Russian Science Foundation, project № 19–19–00241. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021/11
Y1 - 2021/11
N2 - 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 (Li2 B4 O7; 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 o − e → o 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 o − o → e and e − e → e types of interaction, which are potentially attractive for the down-conversion of ultrashort laser pulses.
AB - 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 (Li2 B4 O7; 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 o − e → o 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 o − o → e and e − e → e types of interaction, which are potentially attractive for the down-conversion of ultrashort laser pulses.
KW - Absorption coefficient
KW - Down-conversion
KW - Lithium tetraborate
KW - Refractive index
KW - Temperature dependence
KW - Terahertz spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85118938127&partnerID=8YFLogxK
U2 - 10.3390/cryst11111321
DO - 10.3390/cryst11111321
M3 - Article
AN - SCOPUS:85118938127
VL - 11
JO - Crystals
JF - Crystals
SN - 2073-4352
IS - 11
M1 - 1321
ER -
ID: 34643236