Abstract
AbstractLarge single crystals of polar Li2SeO4·H2O were grown at 343 K from aqueous solution. Temperature dependent thermal expansion coefficients of Li2SeO4·H2O and Li2SO4·H2O were determined within the temperature range 133 K–313 K and coefficients of the pyroelectric effect within the temperature range 183–343 K. Refractive indices between 365 nm and 1530 nm as well as unpolarized absorption spectra of Li2SeO4·H2O and Li2SO4·H2O were measured and phase‐matching curves for second harmonic generation were calculated. Both compounds allow type I and type II phase‐matching at wavelengths from about 650 nm to the near infrared region. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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