Инд. авторы:	Nikolaev N.A., Andreev Y.M., Antsygin V.D., Bekker T.B., Ezhov D.M., Kokh A.E., Kokh K.A., Lanskii G.V., Mamrashev A.A., Svetlichnyi V.A.
Заглавие:	Optical properties of beta-BBO and potential for THz applications
Библ. ссылка:	Nikolaev N.A., Andreev Y.M., Antsygin V.D., Bekker T.B., Ezhov D.M., Kokh A.E., Kokh K.A., Lanskii G.V., Mamrashev A.A., Svetlichnyi V.A. Optical properties of beta-BBO and potential for THz applications // VI INTERNATIONAL CONFERENCE MODERN NANOTECHNOLOGIES AND NANOPHOTONICS FOR SCIENCE AND INDUSTRY. - 2018. - Vol.951. - Art.UNSP 012003. - ISSN 1742-6588.
Внешние системы:	DOI: 10.1088/1742-6596/951/1/012003; РИНЦ: 35487037; SCOPUS: 2-s2.0-85042370208; WoS: 000446239900003;
Реферат:	eng: The anisotropy of optical properties of high quality beta barium borate crystal (beta- BaB2O4, beta-BBO) was studied in the main transparency window by using classic spectroscopic methods and in the range of 0.2 - 2 THz by using THz time-domain spectroscopy. beta-BBO crystals were grown by the top-seeded solution technique in a highly resistive furnace with a heat field of 3-fold axis symmetry. At room temperature (RT), absorption coefficient in the maximal transparency window in grown crystals did not exceed 0.05 cm(-1). Strong absorption anisotropy was observed in 3 - 5 mu m and the THz range. At 1 THz absorption coefficients for e and o wave were, respectively, 7 cm(-1) and 21 cm(-1) at RT; 2 cm(-1) and 10 cm(-1) at 81 K. At the most attractive for out-of-door applications range < 0.4 THz the absorption coefficient is found to be very low: below 0.2 cm(-1) at RT and 1 cm(-1) at 81 K. Refractive indices dispersions measured by THz-TDS were approximated in the form of Sellmeier equations. Birefringence is found quite large for phase matched difference frequency generation (DFG) or down-conversion into the THz range (THz-DFG) under near IR pump at RT and 81 K. Type II (oe-o and eo-o), and type I (ee-e) three wave interactions can be realized at RT. THz-DFG of Nd:YAG laser and KTP OPO can be realized by type II (oe-o) three-wave interaction. For selected spectral ranges of femtosecond Ti:Sapphire laser efficient phase matched and group velocity matched optical rectification can be realized by another two types of three wave interactions. Accounting other well-known attractive physical properties of beta-BBO crystal, wide application in THz technique can be forecasted.
Издано:	2018