Neutron diffraction from thermally fixed gratings in photorefractive lithium niobate crystals

Autor(en): Nee, I
Buse, K
Havermeyer, F
Rupp, RA
Fally, M
May, RP
Stichwörter: HOLOGRAMS; LINBO3; Materials Science; Materials Science, Multidisciplinary; ORIGIN; Physics; Physics, Applied; Physics, Condensed Matter; STORAGE DYNAMICS
Erscheinungsdatum: 1999
Herausgeber: AMER PHYSICAL SOC
Enthalten in: PHYSICAL REVIEW B
Band: 60
Ausgabe: 14
Startseite: R9896-R9899
Zusammenfassung: 
Iron-doped lithium niobate crystals are illuminated with a sinusoidal light pattern (period length 374 nm) at a temperature of about 180 degrees C. Electrons are redistributed and ions drift in the electronic space-charge pattern (''thermal fixing''). At room temperature the ions are almost immobile. A density grating (space-charge field plus inverse-piezoelectric effect) and the ionic grating yield a refractive-index modulation for neutrons (''photorefractive effect''). Neutrons (wavelength 1.39 nm) are diffracted from this grating with an efficiency up to 1.2 x 10(-3). Usually hydrogen ions form the ionic grating. The ions responsible for charge compensation in dehydrated crystals have a much smaller coherent neutron-scattering length and might be identified as lithium. [S0163-1829(99)50738-8].
ISSN: 24699950
DOI: 10.1103/PhysRevB.60.R9896

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