N. A. Nikolaev, Yu. M. Andreev, N. G. Kononova, A. A. Mamrashev, V. D. Antsygin, K. A. Kokh, A. E. Kokh, V. F. Losev, O. I. Potaturkin, “Terahertz optical properties of LBO crystal upon cooling to liquid nitrogen temperature”, Kvantovaya Elektronika, 2018, Volume 48, Number 1,Pages <nobr>19

This article is cited in 11 papers

Nonlinear optical phenomena

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

N. A. Nikolaev^ab, Yu. M. Andreev^c, N. G. Kononova^d, A. A. Mamrashev^ab, V. D. Antsygin^b, K. A. Kokh^de, A. E. Kokh^d, V. F. Losev^a, O. I. Potaturkin^b

^a Institute of High Current Electronics, Siberian Branch of the Russian Academy of Sciences, Tomsk
^b Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk
^c Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch of the Russian Academy of Science, Tomsk
^d Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, Novosibirsk
^e Novosibirsk State University

Abstract: 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 α_x and α_y 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.

Keywords: lithium borate crystal, LBO, THz radiation, absorption coefficient, refractive index.

Received: 06.10.2017
Revised: 15.11.2017