Three image processing experiments were performed by degenerate four‐wave mixing in
photorefractive GaAs. The experiments were imaging by phase conjugation, edge …

We report the first observation of a photorefractive gain coefficient as high as 2.6 cm− 1 in
the undoped liquid‐encapsulated Czochralski‐grown GaAs crystals at 1.06 μm under a dc …

It has been demonstratedI-4 that GaAs is a sensitive photorefractive material with the
potential to be used for optical processing in the infrared region. The advantages of using …

Enhanced two-beam mixing amplification at a wavelength of 1.06 μm obtained by using
sinusoidal electrical fields at 7.7 MHz is reported. The peak measured gains are comparable …

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 …

We describe a new method for photorefractive response time measurement in fast
photorefractive crystals based on continuous phase modulation in two-wave mixing. We …

Sensitive and low power generation of phase conjugate beams in the near IR became
possible after the discovery of the photorefractive effect in GaAs and other compound …

We report observation of a rotation in the polarization of the two photorefractive recording
beams in GaAs for a configuration with the internally generated space‐charge field along …

The photorefractive effect is an extremely versatile nonlinear mechanism for parallel optical
processing. Applications such as image amplification, real-time interferometry, convolution …

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 …