Thermal expansion, pyroelectricity and linear optical properties of Li2SeO4.H2O and Li2SO4.H2O by P. Becker, S. Ahrweiler, P. Held, H. Schneeberger, L. Bohatý

Crystal Research and Technology

Cryst. Res. Technol. 38, 881 (2003) - Abstract -

Thermal expansion, pyroelectricity and linear optical properties of Li₂SeO₄^.H₂O and Li₂SO₄^.H₂O

P. Becker, S. Ahrweiler, P. Held, H. Schneeberger, L. Bohatý

Institut für Kristallographie der Universität zu Köln, Zülpicher Str. 49 b, 50674 Köln, Germany

Keywords	Li2SeO4.H2O, crystal growth, thermal expansion, pyroelectricity, refractive indices, phase matching
PACS	81.10.Dn, 65.40.De, 77.70.+a, 78.20.Ci
DOI	10.1002/crat.200310107

Large 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.

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