Abstract

The temperature dispersions of refractive indices and absorption coefficients in the terahertz range for the spectra of ${{\rm Er}^{3 + }}$Er³⁺-, ${{\rm Yb}^{3 + }}$Yb³⁺-, and ${{\rm Cr}^{3 + }}$Cr³⁺-activated potassium niobate and lithium niobate crystals, grown by the Czochralski method with liquid recharge, are considered. A strong temperature dependence for the refractive index of the LiNbO₃:Er,Yb crystal was found—${3.5}\; \times \;{{10}^{ - 3}}\;{{\rm K}^{ - 1}}$3.5×10⁻³K⁻¹. A minimum temperature dependence of ${0.2}\; \times \;{{10}^{ - 3}}\;{{\rm K}^{ - 1}}$0.2×10⁻³K⁻¹ for the refractive index of the LiNbO₃:Cr crystal was also obtained.

© 2020 Optical Society of America

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