| 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 β-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 β-BBO and potential for THz applications // Journal of Physics: Conference Series. - 2018. - Vol.951. - Iss. 1. - Art.012003. - ISSN 1742-6588. |
| Внешние системы: | DOI: 10.1088/1742-6596/951/1/012003; SCOPUS: 2-s2.0-85042370208; |
| Реферат: | eng: The anisotropy of optical properties of high quality beta barium borate crystal (β-BaB2O4, β-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. β-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 μm 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 β-BBO crystal, wide application in THz technique can be forecasted. © Published under licence by IOP Publishing Ltd. |
| Ключевые слова: | Crystal symmetry; Crystals; Femtosecond lasers; Laser pulses; Nanophotonics; Nanotechnology; Terahertz waves; THz time domain spectroscopy; Three-wave interactions; Spectroscopic method; Resistive furnaces; Phase-matched difference-frequency generations; Optical rectifications; Anisotropy; Absorption co-efficient; Transparency; Time domain analysis; Terahertz spectroscopy; Spectroscopy; Spectroscopic analysis; Sapphire; Refractive index; Phase matching; Optical properties; Optical frequency conversion; Neodymium lasers; Neodymium compounds; Beta-barium-borate crystals; Barium compounds; |
| Издано: | 2018 |
| Физ. характеристика: | 012003 |
| Конференция: | Название: 6th International conference on Modern Nanotechnologies and Nanophotonics for Science and Industry, ICMNNSI 2017 Даты проведения: 2017-11-09 - 2017-11-13 |