K Walsh, TJ Hall - Applied optics, 1989 - opg.optica.org
The photorefractive effect is of considerable interest for parallel optical processing operations. Semiconductor materials have received attention because of their potentially fast …
A Kadys, V Gudelis, M Sudzius… - Journal of Physics …, 2004 - iopscience.iop.org
We demonstrate a novel way to analyse carrier recombination and transport processes in photorefractive semiconductors via the exposure characteristics of light induced diffraction …
Three image processing experiments were performed by degenerate four‐wave mixing in photorefractive GaAs. The experiments were imaging by phase conjugation, edge …
Two-wave mixing gain in photorefractive GaAs: Cr using the moving grating technique has been measured. The results compare well to theory when a value of τ di/τ 2 measured by …
We consider phase conjugation via degenerate four-wave mixing in photorefractive crystals when more than one grating mechanism is operative. A method for exact solution of the …
We have used a 20-kHz ac square-wave electric field to enhance the beam-coupling gain and the degenerate four-wave mixing reflectivity of photorefractive GaAs at 1.06 μm. The …
K Walsh, TJ Hall, RE Burge - Optics letters, 1987 - opg.optica.org
The polarization dependence of two-wave mixing for two common crystal orientations is described and theoretical and experimental results given. The direction of energy exchange …
Slowdown of Gaussian “dark pulses” in photorefractive crystal using a two-wave mixing method is shown at room temperature. In agreement with our theoretical model, the …
We measure the absorption coefficient and refractive index changes produced in photorefractive quantum wells of GaAs by using a high-sensitivity periodically phase …