Fundamental characteristics of space-charge waves in photorefractive sillenite crystals

HC Pedersen, DJ Webb, PM Johansen - JOSA B, 1998 - opg.optica.org
We investigate experimentally the fundamental characteristics of space-charge waves
excited in a photorefractive crystal of Bi_12SiO_20. Features such as their transient rise and …

Parametric oscillation in photorefractive media

HC Pedersen, PM Johansen - JOSA B, 1995 - opg.optica.org
We present an analysis of what is called parametric oscillation in photorefractive media. It is
shown theoretically that when a running grating and a constant electric field are applied to a …

Photorefractive space–charge field formation: linear and nonlinear effects

PM Johansen - Journal of Optics A: Pure and Applied Optics, 2003 - iopscience.iop.org
Theoretical and experimental investigations of the linear and nonlinear space–charge field
effects in photorefractive materials are reviewed. In particular, the aim is to explore the …

Analysis of wave coupling in photorefractive cubic media far from the paraxial limit

HC Pedersen, PM Johansen - JOSA B, 1995 - opg.optica.org
A rigorous three-dimensional theoretical description of the two-wave mixing processes in
cubic crystals is presented. The theory includes linear birefringence, self-diffraction, and …

Ac square-wave field-induced subharmonics in photorefractive sillenite: threshold for excitation by inclusion of higher harmonics

PM Johansen, HC Pedersen, EV Podivilov, BI Sturman - JOSA B, 1999 - opg.optica.org
We investigated both analytically and numerically the simultaneous influence of higher-
harmonic gratings and subharmonic gratings on the threshold for generation of the …

Space-charge field in photorefractive media with a constant applied magnetic field

PM Johansen, AS Jensen - JOSA B, 1991 - opg.optica.org
The photorefractive band transport model is extended to include magnetic effects. The
Newtonian equation of motion for electrons in the conduction band under combined electric …

双中心全息记录的矢量分析与记录方向优化

周煜, 刘立人, 刘德安, 闫爱民, 栾竹 - 光学学报, 2007 - cqvip.com
对描述双掺杂晶体非挥发性全息记录动力学过程的Kukhtarev 方程进行了矢量分析,
分析中考虑了体光生伏特效应和外加电场的作用. 在小信号近似的基础上给出了双中心全息记录 …

Excitation of higher harmonic gratings in AC-field biased photorefractive crystals

HC Pedersen, PM Johansen, EV Podivilov… - Optics …, 1998 - Elsevier
We analyze the nonlinear excitation of holographic gratings in a photorefractive crystal
being subject to an alternating electric field and a stationary light interference pattern. The …

Theory of nonlinear multiple-grating interaction in diffusion-dominated photorefractive media

HC Pedersen, PE Andersen, PM Petersen… - JOSA B, 1996 - opg.optica.org
Using a new model based on the so-called perturbational approach, we present a
theoretical analysis of nonlinear multiple-grating interaction in diffusion-dominated …

Longitudinal, degenerate, and transversal photorefractive parametric oscillation: theory and experiment

HC Pedersen, PM Johansen - JOSA B, 1997 - opg.optica.org
We present a theoretical model of photorefractive parametric oscillation that is capable of
explaining the occurrence of so-called longitudinal, degenerate, and transversal parametric …