Journal ArticleDOI
Efficiency and polarization characteristics of photorefractive diffraction in a Bi 12 SiO 20 crystal
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TLDR
In this paper, the polarization properties of volume phase gratings induced in photorefractive materials that are both optically active and linearly birefringent, such as Bi12SiO20, Bi12GeO20 and Bi12TiO20 have been studied under the assumption of a nondepleted readout beam.Abstract:
We study the polarization properties of volume phase gratings induced in photorefractive materials that are both optically active and linearly birefringent, such as Bi12SiO20, Bi12GeO20, and Bi12TiO20. Analytic expressions for the diffraction efficiency and for the orientation and the ellipticity of the diffracted light have been derived for the 〈110〉 and 〈001〉 configurations under the assumption of a nondepleted readout beam. The physical parameters that determine the polarization characteristics of the diffracted light are the orientation of the readout vector, the crystal thickness, the optical activity, and the electric-field-induced linear birefringence. Our results are valid for arbitrary values of these parameters. The particular cases of zero optical activity, zero linear birefringence, a thin crystal, or a specific readout-vector orientation can be deduced from the general formulas. The analytic expressions that we have derived permit an optimal choice of different parameters for the image-processing and beam-coupling applications of these materials.read more
Citations
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Journal ArticleDOI
Phase-shifting real-time holographic interferometry that uses bismuth silicon oxide crystals
Marc Georges,Philippe Lemaire +1 more
TL;DR: It is shown that quantitative measurements are possible for low-intensity object beams (8 µW/cm(2)) and a large observed area and the temporal interferogram erasure is studied and is found weakly perturbative for the measured phase.
Journal ArticleDOI
Influence of the polarization direction of two-beam coupling in photorefractive Bi12SiO20: Diffusion regime
S. Mallick,D. Rouède +1 more
TL;DR: In this article, the authors derived analytical expressions for signal amplification in the diffusion regime for two commonly used crystallographic configurations, G ∥ and G∥, G being the grating vector.
Journal ArticleDOI
The Lattice Compatibility Theory (LCT): An attempt to explain Urbach tailing patterns in copper-doped bismuth sillenites (BSO) and germanates (BGO)
P. Petkova,Karem Boubaker +1 more
TL;DR: In this article, the authors tried to give an explanation to the spectacular Urbach tailing associated to some nano-scale lattice disordering which has been recorded in (BSO) and germanates (BGO) compounds.
Journal ArticleDOI
Orientation and polarization effects of two-beam coupling in a cubic optically active photorefractive piezoelectric BSO crystal
TL;DR: The results of the experimental study of two-beam coupling in BSO are in good agreement with theory as discussed by the authors, and the optimum conditions for energy exchange in a BSO crystal with thickness d = 2.19 mm are realized at azimuths ψ ≅ 23° and ψ ∼ 13° for orientation angles θ ≅ 55° and θ ∼ 305°, respectively.
Journal ArticleDOI
Polarization properties of enhanced self-diffraction in sillenite crystals
TL;DR: In this article, coupled wave equations were combined with a linearized model of the photorefractive recording process (single trap level, single mobile charge species) to analyze the impact of self-diffraction effects on the polarization state evolution.
References
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Journal ArticleDOI
Coupled wave theory for thick hologram gratings
TL;DR: In this paper, a coupled wave analysis of the Bragg diffraction of light by thick hologram gratings is given, analogous to Phariseau's treatment of acoustic gratings and to the dynamical theory of X-ray diffraction.
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Coherent signal beam amplification in two-wave mixing experiments with photorefractive Bi12SiO20 crystals
J.P. Huignard,A. Marrakchi +1 more
TL;DR: In this article, an additional phase shift is established between the photoinduced index modulation (phase volume hologram) and the incident fringe pattern, which is introduced by either moving the crystal or the interference fringes at a constant speed.
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Polarization properties of photorefractive diffraction in electrooptic and optically active sillenite crystals (Bragg regime)
TL;DR: In this article, a set of coupled-wave equations that characterize the Bragg regime has been derived for the 〈110〉 and the ¾¾ ¾ crystallographic orientations typically employed in volume holographic storage and multi-wave-mixing applications.
Journal ArticleDOI
Analysis of anisotropic dielectric gratings
Katsu Rokushima,Jiro Yamakita +1 more
TL;DR: In this article, the propagation of electromagnetic waves in the periodic anisotropic media is described by coupled-wave equations in a unified matrix form expressing the coupling of the space harmonics in the grating region.
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Spatial frequency dependence of the energy transfer in two-wave mixing experiments with BSO crystals
TL;DR: In this paper, energy transfer between two beams interfering in an electrooptic Bi12SiO20 crystal is analyzed as a function of the spatial frequency of the recorded hologram.