Abstract
Lithium niobate and potassium niobate crystals of near-stoichiometric composition were grown with the help of the Czochralski method with liquid and ceramic charging. Birefringence of the grown lithium niobate sample is Δn = 1.5 at 1 THz frequency, pleochroism in absorption on 1 THz frequency makes preferable the using of the extraordinary wave because of the lower absorption coefficient (14 cm−1). The absorption coefficient for the grown crystal of potassium niobate is 24 cm−1 at 1 THz frequency.
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