Origin of thermal fixing in photorefractive lithium niobate crystals

Autor(en): Buse, K
Breer, S
Peithmann, K
Kapphan, S
Gao, M
Kratzig, E
Stichwörter: BATIO3; CONDUCTIVITY; DOPED LINBO3; ELECTROOPTIC COEFFICIENTS; FIXATION; FIXED HOLOGRAMS; HOLOGRAPHIC GRATINGS; INDUCED CHARGE TRANSPORT; Materials Science; Materials Science, Multidisciplinary; PHASE HOLOGRAMS; Physics; Physics, Applied; Physics, Condensed Matter; STORAGE
Erscheinungsdatum: 1997
Herausgeber: AMERICAN PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 56
Ausgabe: 3
Startseite: 1225
Seitenende: 1235
Zusammenfassung: 
Macroscopic light patterns are thermally fixed in photorefractive iron- or copper-doped LiNbO3 crystals with different hydrogen concentrations. Spatially resolved absorption measurements reveal unambiguously that migrating hydrogen ions compensate for the space-charge fields at enhanced temperatures if the hydrogen concentration is large enough. However, in crystals with small hydrogen concentrations thermal fixing is also possible and another compensation mechanism appears. Partial depolarization of the crystals does not contribute to the charge compensation processes. The refractive-index pattern is developed by homogeneous illumination and measured by an interferometric technique. The development process is described considering the spatially modulated concentrations of filled and empty electron traps, which cause spatially modulated currents, even for homogeneous illumination.
ISSN: 10980121
DOI: 10.1103/PhysRevB.56.1225

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