Terahertz optical properties of LBO crystal upon cooling to liquid nitrogen temperature

The anisotropy of optical properties of nonlinear lithium borate (LBO) crystals in the range of 0.2 - 2 THz is investigated by time-domain THz spectroscopy at room temperature and at T = 81 K. It is shown that the birefringence dramatically decreases upon cooling, as a result of which phase-matching...

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Published inQuantum electronics (Woodbury, N.Y.) Vol. 48; no. 1; pp. 19 - 21
Main Authors Nikolaev, N.A., Andreev, Yu.M., Kononova, N.G., Mamrashev, A.A., Antsygin, V.D., Kokh, K.A., Kokh, A.E., Losev, V.F., Potaturkin, O.I.
Format Journal Article
LanguageEnglish
Published Bristol Kvantovaya Elektronika, Turpion Ltd and IOP Publishing 01.01.2018
IOP Publishing
Subjects
absorption coefficient
Absorptivity
ANISOTROPY
BIREFRINGENCE
BORATES
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Cooling
CRYSTALS
LBO
Liquid nitrogen
LITHIUM
lithium borate crystal
Lithium borates
NITROGEN
Optical components
OPTICAL PROPERTIES
Periodic structures
PERIODICITY
Phase matching
refractive index
Room temperature
SPECTROSCOPY
THz radiation
THZ RANGE
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Summary:The anisotropy of optical properties of nonlinear lithium borate (LBO) crystals in the range of 0.2 - 2 THz is investigated by time-domain THz spectroscopy at room temperature and at T = 81 K. It is shown that the birefringence dramatically decreases upon cooling, as a result of which phase-matching conditions cannot be implemented. At the same time, the absorption coefficients αx and αy are found to decrease significantly with decreasing temperature, due to which the LBO crystal becomes a promising material for generating THz radiation via optical rectification and fabricating periodic structures and optical elements.
ISSN:1063-7818
1468-4799
DOI:10.1070/QEL16515