Photorefractive properties of undoped lithium tantalate crystals for various composition

Lithium tantalate crystals of compositions ranging from 48.3mol%to50.0mol% lithium oxide are fabricated by vapor transport equilibration. Light-induced refractive index changes of the crystals are investigated with holographic methods at usual cw-laser intensities (≈105W∕m2) and with a single focuse...

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Bibliographic Details
Published in:Journal of applied physics 2004-12, Vol.96 (12), p.7455-7459
Main Authors: Holtmann, F., Imbrock, J., Bäumer, Ch, Hesse, H., Krätzig, E., Kip, D.
Format: Article
Language:English
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Summary:Lithium tantalate crystals of compositions ranging from 48.3mol%to50.0mol% lithium oxide are fabricated by vapor transport equilibration. Light-induced refractive index changes of the crystals are investigated with holographic methods at usual cw-laser intensities (≈105W∕m2) and with a single focused laser beam at high light intensities up to 2×107W∕m2. In stoichiometric crystals the index changes are reduced by more than two orders of magnitude when compared with congruently melting ones. Simultaneously, the normalized photoconductivity σph∕I, where I is the light intensity, increases by nearly two orders of magnitude. Therefore, stoichiometric lithium tantalate is an attractive material for applications such as frequency conversion via quasi-phase matching.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1805189