LIGHT-INDUCED THERMAL GRATINGS IN LINBO3-FE

Autor(en): JERMANN, F
BUSE, K
Stichwörter: INDUCED CHARGE-TRANSPORT; LITHIUM-NIOBATE; Optics; PHOTOREFRACTIVE PROCESS; Physics; Physics, Applied
Erscheinungsdatum: 1994
Herausgeber: SPRINGER VERLAG
Journal: APPLIED PHYSICS B-LASERS AND OPTICS
Volumen: 59
Ausgabe: 4
Startseite: 437
Seitenende: 443
Zusammenfassung: 
Holographic gratings are recorded in LiNbO3:Fe using frequency-doubled pulses of a Q-switched Nd:YAG laser (light wavelength lambda = 532 nm, pulse duration t(p) 20 ns). We monitor diffraction efficiencies of the holograms during and several milliseconds after exposure. Variations of Fe2+ concentration, light intensity, and fringe spacing show that different types of gratings are involved: photochromic, thermooptic, pyroelectric, and space-charge gratings. The influence of the internal pyroelectric field on the light-induced charge transport is discussed in terms of a two-center model. Pyroelectric and bulk photovoltaic effect are shown to partially compensate each other. In LiNbO3:Fe, the photovoltaic effect is the dominant charge-driving force for our recording conditions.
ISSN: 09462171
DOI: 10.1007/BF01081066

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