Journal
APPLIED PHYSICS B-LASERS AND OPTICS
Volume 101, Issue 4, Pages 811-815Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-010-4296-z
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Funding
- Russian Foundation for Basic Research [08-02-00555, 10-02-00427, 09-02-92003]
- Federal Agency for Science and Innovation [02.740.11.0223]
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We study dispersion of the dielectric function real part epsilon' 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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