Dispersion of the dielectric function real part for Mg:LiNbO3 crystals at terahertz frequencies |
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| Authors: | K. A. Kuznetsov S. P. Kovalev G. K. Kitaeva T. D. Wang Y. Y. Lin Y. C. Huang I. I. Naumova A. N. Penin |
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| Affiliation: | 1. Department of Physics, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia
2. Institute of Photonics Technologies, Department of Electrical Engineering, National Tsing Hua University, Hsinchu, 30013, Taiwan
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| Abstract: | We study dispersion of the dielectric function real part ε′ in the terahertz-frequency range for bulk and periodically poled congruent LiNbO3 and Mg:LiNbO3 crystals. The concentration of Mg in Mg:LiNbO3 samples was close to 5 mol%, which is the photorefractive threshold. Approximate expressions for extraordinary polariton dispersion dependence were obtained in the range 0.5–6.5 THz. The influence of Mg-dopant on the optical properties of crystals in the terahertz range is revealed. Changes of the defect structure of lithium niobate crystals are discussed. |
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