Hole-electron electrical coupling in photorefractive materials
TLDR
In this article, an improved mathematical model for photorefractive materials exhibiting hole-electron competition where the constants accounting for electrical coupling between holes and electrons are independently adjusted for each one of them is presented.Abstract:
We describe an improved mathematical model for photorefractive materials exhibiting hole-electron competition where the constants accounting for electrical coupling between holes and electrons are independently adjusted for each one of them. Experimental results from photorefractive titanosillenite crystals with hole-electron competition, and particularly from a vanadium doped sample, are shown to be better described by this modified model than by the classical one already reported in the literature.read more
Citations
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Journal ArticleDOI
Nonlinear photovoltaic effect in Sillenite photorefractive crystals
Ivan de Oliveira,Danilo Augusto Capovilla,André L. Moura,Varese S. Timóteo,Jesiel F. Carvalho,Jaime Frejlich +5 more
TL;DR: In this article, the presence of photovoltaic effect in some Sillenite photorefractive crystals and compare their behavior with that of the well known photoveoltaic LiNbO3:Fe crystal.
Journal ArticleDOI
Stabilized photorefractive running holograms, with arbitrarily selected phase shift, for material characterization
TL;DR: In this paper, the authors report on the recording of stabilized running holograms in photorefractive materials with arbitrarily selected phase shift φ between the transmitted and difracted beams propagating along the same direction behind the photore-fractive crystal.
Journal ArticleDOI
Experimental determination of effective electro-optic coefficient and electric screening field factor in the electrically induced birefringent Bi12TiO20 crystal by using an oblique incidence setup
TL;DR: In this paper, the optical intensity variation induced by an applied electric field (E App ), which is transmitted through an undoped photorefractive Bi 12 TiO 20 (BTO) crystal in an oblique incidence setup, was modeled taking into account the transmission coefficients for the polarization plane parallel and perpendicular to the incidence plane, as well as the birefringence induced by the E App, which changes the components of the polarization vector of the light beam.
Proceedings ArticleDOI
Holographic recording in photorefractive Bi2TeO5 crystals at high intensity
TL;DR: In this article, the authors reported the recording of nearly 35% diffraction efficiency holograms of photorefractive nature in Bi 2 TeO 5 crystals, using 633 nm wavelength laser beams.
Journal ArticleDOI
Simple digital system for the stabilization of holographic recordings of a slow grating in photorefractive materials.
TL;DR: In this article, a digital system for the stabilization of an interference pattern of light fringes is presented, which uses a Raspberry Pi computer to operate a continuously stabilized setup and, because of the particular features of this stabilization setup, it is possible to record slow gratings in photorefractive materials.
References
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Journal ArticleDOI
Hole–electron competition in photorefractive gratings
TL;DR: A band-conduction model for the photorefractive effect is derived in which simultaneous hole and electron conduction is taken into account and the anomalous behavior of nearly compensated BaTiO3 crystals in beam-coupling experiments is explained.
Journal ArticleDOI
Holographic method for the determination of photo-induced electron and hole transport in electro-optic crystals
R. Orlowski,E. Krätzig +1 more
TL;DR: In this paper, a method based on holographic techniques is proposed to determine electron and hole contributions to photo-induced charge transport in highly insulating electro-optic crystals, and experimental results for transition metal doped LiNbO3- and LiTaO3 -crystals are presented.
Book
Photorefractive Materials: Fundamental Concepts, Holographic Recording and Materials Characterization
TL;DR: In this paper, the authors present a procedure for detecting a real-time hologram with anisotropic diffraction and optical activity in LiNbO3:Fe materials.
Journal ArticleDOI
Holographic recording in photorefractive crystals with simultaneous electron‐hole transport and two active centers
S. Zhivkova,M. Miteva +1 more
TL;DR: In this article, a theoretical model of the formation and behavior of holographic gratings in photorefractive crystals, based on the assumption of two types of active centers being involved and simultaneous electron-hole transport, is derived.
Journal ArticleDOI
Direct near infrared photorefractive recording and pre-exposure controlled hole–electron competition with enhanced recording in undoped Bi12TiO20
TL;DR: In this paper, the authors reported the direct recording of electron-based photorefractive hologram in nominally undoped Bi12TiO20 crystals using 780 nm wavelength light without pre-exposure or any kind of previous processing.