Optical properties of β-BBO and potential for THz applications

doi:10.1088/1742-6596/951/1/012003

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DOI Доступ к ресурсу на сайте издателя			10.1088/1742-6596/951/1/012003

#оптические свойства

#терагерцовый диапазон

#бета-борат бария

Title: Optical properties of β-BBO and potential for THz applications
Creator: Andreev, Yury M.
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Antsygin, Valery D.
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Bekker, T. B.
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Ezhov, Dmitry M.
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Kokh, A. E.
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Kokh, Konstantin A.
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Lanskii, Grigory V.
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Mamrashev, Alexander A.
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Svetlichnyi, Valerii A.
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Nikolaev, Nazar A.
Date: 2018
DOI: 10.1088/1742-6596/951/1/012003
Description: 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.