It is remarkable that photorefractive crystals, such as barium titanate, display such enormous
optical nonlinearities with the minimum of optical intensity levels, typically no more than that …

Photorefraction is a nonlinear optical effect in which large nonlinearities can be observed at
relatively low optical power levels. This phenomenon has evolved from a laboratory curiosity …

A key element in the optical implementation of any neural network is the nonlinear neuron.
The most common required feature of this device is a saturating response to an activation …

We show how photorefractive two wave mixing allows a nonlinear input-output response
providing compational abilities of decision. Particularly, we investigate the realization of a …

In recent years, there have been extensive research efforts on photorefractive phenomena,
materials, devices and applications. Much of the progress has been achieved and some …

The photorefractive effect of nonlinear materials has now proved to be invaluable for new
techniques in interferometry, phase conjugation, locking of laser diodes, image processing …

A new concept and experimental demonstration of a bifurcating optical pattern recognizer
that uses a nonlinear gain saturation memory medium such as a high-gain photorefractive …

We discuss the ever-expanding applications of photorefractive materials. Recent
demonstrations include the use of the photorefractive crystals barium titanate and strontium …

Ob\\iecilncl 19< 7388l PI-'c~ r! lf'L? i switching devices are required. in this case to act as
thresholding elements. Dr David Selviah (UCL) described the apparent advantage of using …

THIS is a beautiful monograph and anyone with a serious interest in the potential
applications of photorefractive media should read it. The chapter titles give a good idea of …