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 | Journal: | PHYSICAL REVIEW B | Volumen: | 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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geprüft am 23.05.2024