Photorefractive properties of LiNbO3 crystals doped by copper diffusion

Autor(en): Peithmann, K
Hukriede, J
Buse, K
Kratzig, E
Stichwörter: INDUCED CHARGE-TRANSPORT; LITHIUM-NIOBATE; Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Applied; Physics, Condensed Matter; STORAGE
Erscheinungsdatum: 2000
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 61
Ausgabe: 7
Startseite: 4615
Seitenende: 4620
Zusammenfassung: 
Lithium niobate volume crystals (up to 1 mm thick) are doped by indiffusion of thin layers of evaporated copper. The obtained samples are investigated by conventional electrical and holographic methods. Saturation values Delta n(s) of the refractive-index changes, bulk-photovoltaic current densities j(phv), and photoconductivities sigma(ph) are measured utilizing samples with copper concentrations in the range (2.2-145) X 10(24) m(-3). Comparison with experimental data for melt-doped lithium niobate shows that the photorefractive properties do not depend on the doping technique. Another important outcome is that the refractive-index changes saturate at 7 x 10(-4) (ordinary light polarization, green light) for copper concentrations larger;than 60 X 10(24) m(-3) This is caused by a strong increase of the photoconductivity for high doping levels.
ISSN: 24699950
DOI: 10.1103/PhysRevB.61.4615

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