Photorefractive properties of undoped lithium tantalate crystals for various composition

Autor(en): Holtmann, F
Imbrock, J
Baumer, C
Hesse, H
Kratzig, E
Kip, D
Stichwörter: DEPENDENCE; GROWTH; NIOBATE CRYSTALS; Physics; Physics, Applied; STOICHIOMETRIC LITAO3
Erscheinungsdatum: 2004
Herausgeber: AMER INST PHYSICS
Journal: JOURNAL OF APPLIED PHYSICS
Volumen: 96
Ausgabe: 12
Startseite: 7455
Seitenende: 7459
Zusammenfassung: 
Lithium tantalate crystals of compositions ranging from 48.3 mol % to 50.0 mol % 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 (approximate to10(5) W/m(2)) and with a single focused laser beam at high light intensities up to 2x10(7) W/m(2). 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 sigma(ph)/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. (C) 2004 American Institute of Physics.
ISSN: 00218979
DOI: 10.1063/1.1805189

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