Photorefractive effect

About: Photorefractive effect is a research topic. Over the lifetime, 9818 publications have been published within this topic receiving 145816 citations.

Holographic storage in electrooptic crystals. i. steady state

Abstract: The non-linear theory of the self-diffraction on the light induced grating of refractive index in electrooptic crystals is developed. The intensities of the diffracted beams, the diffraction efficiency, and the shape of the surfaces of equal index change are calculated analytically for saturation holograms.Holographic storage in nominally pure reduced crystals of LiNbO3 is studied experimentally. It is shown that the developed theory in diffusion approximation satisfactorily describes the experimental data.

Lithium niobate: Summary of physical properties and crystal structure

Abstract: Ferroelectric lithium niobate (LiNbO3) is widely used in integrated and guided-wave optics because of its favorable optical, piezoelectric, electro-optic, elastic, photoelastic, and photorefractive properties. However, detailed summaries of its pertinent physical properties and crystal structure are not readily available. In this tutorial paper, the important tensor physical properties and their mathematical descriptions are compiled and presented. The essential features of the structure of lithium niobate, including its hexagonal and rhombohedral unit cells, are illustrated and the principal (Cartesian) axes used in the description of the anisotropic properties are specified relative to the crystal structure. Errors in property coefficient values and structure information that have been propagated in the literature are corrected.

Nonlinear Optics of Organic Molecules and Polymers

Abstract: Introduction to Nonlinear Optics, Y.Z. Yu, K.Y. Wong, and A.F. Garito Computational Evaluation of Second-Order Optical Nonlinearities, J.O. Morley and D. Pugh Measurement Techniques of Refractive Indices and Second-Order Optical Nonlinearities, T. Watanabe, H. Singh Nalwa, and S. Miyata Organic Materials for Second-Order Nonlinear Optics, H. Singh Nalwa, T. Watanabe, and S. Miyata Phase-Matched Second Harmonic Generation in Organic Materials, T. Watanabe, H. Singh Nalwa, and S. Miyata Electro-Optic Effects in Organic Molecules and Polymers, Ch. Bosshard and P. Gunter Nonlinear Optical Polymers and High-Speed Electro-Optic Modulators, C.-C. Teng An Introduction to Photorefractive Polymers, B. Keppelen, K. Meerholz, and N. Peyghambarian Computational Evaluation of Third-Order Optical Nonlinearity, H. Singh Nalwa Measurements Techniques for Third-Order Optical Nonlinearities, H. Singh Nalwa Organic Materials for Third-Order Nonlinear Optics, H. Singh Nalwa Applications of Organic Materials in Third-Order Nonlinear Optics, G.I. Stegeman Organic and Metal-Containing Reverse Saturable Absorbers for Optical Limiting, J.W. Perry Applications of Nonlinear Optics to Passive Optical Limiting, E.W. Van Stryland, D.J. Hagan, T. Xia, and A.A. Said Index

Theory and applications of guided-mode resonance filters

Abstract: The guided-mode resonance properties of planar dielectric waveguide gratings are presented and explained. It is shown that these structures function as filters that produce complete exchange of energy between forward- and backward-propagating diffracted waves with smooth line shapes and arbitrarily narrow filter linewidths. Simple expressions based on rigorous coupled-wave theory and on classical slab waveguide theory give a clear view and quantification of the inherent TE/TM polarization separation and the free spectral ranges of the filters. Furthermore, the resonance regimes, defining the parametric regions of the guided-mode resonances, can be directly visualized. It is shown that the linewidths of the resonances can be controlled by the grating modulation amplitude and by the degree of mode confinement (refractive-index difference at the boundaries). Examples presented of potential uses for these elements include a narrow-line polarized laser, a tunable polarized laser, a photorefractive tunable filter, and an electro-optic switch. The guided-mode resonance filter represents a basic new optical element with significant potential for practical applications.

High‐voltage bulk photovoltaic effect and the photorefractive process in LiNbO3

Abstract: Photocurrents in doped LiNbO3 crystals are shown to be due to a bulk photovoltaic effect with saturation voltages in excess of 1000 V (∼105 V/cm). This effect accounts for the light‐induced index changes in LiNbO3. An explanation of the photovoltaic effect, based on the asymmetry of the lattice, is proposed.