Photorefractive properties of tetragonal KTa0.52Nb0.48O3:Fe crystals and explanation by the three-valence charge-transport model

Autor(en): Buse, K
Loheide, S
Sabbert, D
Kratzig, E
Stichwörter: BATIO3; INTENSITY-DEPENDENT ABSORPTION; KNBO3; LASER-PULSES; LIGHT-INDUCED ABSORPTION; Optics; PHOTOCONDUCTIVITY; POTASSIUM NIOBATE; STRONTIUM-BARIUM NIOBATE; TANTALATE-NIOBATE CRYSTALS; TITANATE
Erscheinungsdatum: 1996
Herausgeber: OPTICAL SOC AMER
Journal: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volumen: 13
Ausgabe: 11
Startseite: 2644
Seitenende: 2651
Zusammenfassung: 
Photoconductivities, dynamics of light-induced absorption changes, and dark relaxations of holographic gratings are measured in as-grown and oxidized tetragonal potassium tantalate niobate crystals (KTa0.52Nb0.48O3) doped with iron. A sublinear intensity dependence of photoconductivity, buildup, steady-state value, and relaxation of the induced absorption changes, nonexponential dark relaxations of holographic gratings, and further holographic measurements are well explained, qualitatively and quantitatively, in terms of the three-valence charge-transport model, i.e., considering one impurity center occurring in three different valence states. Most probably the responsible photorefractive center is Fe-3+,Fe-4+,Fe-5+. (C) 1996 Optical Society of America.
Beschreibung: 
5th Topical Meeting on Photorefractive Materials, Effects, and Devices, ESTES PK, CO, JUN, 1995
ISSN: 07403224
DOI: 10.1364/JOSAB.13.002644

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