John AuYeung

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Liquid-crystal materials are composed of molecules with strong anisotropy. An optical field can induce appreciable molecular alignment along the field, resulting in a change of the index of refraction that is proportional to the optical intensity. Third-order nonlinear optical phenomena, such as self-focusing of light,1'2 stimulated scattering,3 and(More)
A nonlinear optical technique is described that performs, essentially instantaneously, the functions of spatial correlation and convolution of spatially encoded waves. These real-time operations are accomplished by mixing spatially dependent optical fields in the Fourier-transform plane of a lens system. The use of a degenerate four-wave mixing scheme(More)
A theory for Raman fiber laser oscillators is presented. The Stokes output and the residual pump power are shown to be calculable from a knowledge of the input pump power and the fiber characteristics. The evolution of the pump and the Stokes waves along the fiber are also obtained. The threshold pump power and the oscillation condition are considered. Pump(More)
The generation of time-reversed wavefronts via degenerate four-wave mixing has been the topic of many recent theoretical' and experimental2 investigations. Potential applications of this interaction include active filters3 and real-time holographic devices.4' 5 Being a third-order nonlinear optical process, this phenomenon generally requires high-laser-beam(More)
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