Electrooptic and photorefractive properties of ferroelectric barium-calcium titanate crystals

Autor(en): Kuper, C
Buse, K
Van Stevendaal, U
Weber, M
Leidlo, T
Hesse, H
Kratzig, E
Stichwörter: ABSORPTION; BA1-XSRXTIO3; barium-calcium titanate; BATIO3; charge transport processes; HOLOGRAPHIC STORAGE; IMAGE SUBTRACTION; KNBO3; Materials Science; Materials Science, Multidisciplinary; PHOTOCONDUCTIVITY; photorefractive crystals; Physics; Physics, Condensed Matter
Erscheinungsdatum: 1998
Herausgeber: GORDON BREACH SCI PUBL LTD
Journal: FERROELECTRICS
Volumen: 208
Ausgabe: 1-4
Startseite: 213
Seitenende: 223
Zusammenfassung: 
Barium-calcium titanate of congruently melting composition Ba0.77Ca0.23TiO3 is a novel photorefractive crystal. The refractive, electrooptic and photorefractive properties of an undoped as grown sample are investigated: The refractive indices are slightly smaller than those of BaTiO3, but the electrooptic coefficients r(113) = 36 /- 3 pm V-1 and r(333) = 140 /- 5 pm V-1 (light wavelength 514.5 nm) are larger. Light-induced absorption and a sublinear photoconductivity indicate the participation of a shallow level in the charge transport. There are no space charge limiting effects; bulk photovoltaic fields of the order of 15 kV m(-1) are present. The obtained two-beam coupling gain coefficients for ordinarily and extraordinarily polarized light are 160 m(-1) and 425 m(-1), respectively. In summary, barium-calcium titanate is a very promising crystal which will compete with barium titanate.
ISSN: 00150193
DOI: 10.1080/00150199808014876

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