The optical writing phenomenon observed on azoaromatic-containing polymer thin films exhibits a writing rate proportional to the intensity of the writing beam. This property of the mechanism for optically inducing dichroism and birefringence results directly in nonlinear optical behavior in the thin film. The net phase retardation obtainable and the writing rates are functions of the thin-film thickness that reflect this nonlinear behavior.
Light which is emitted from a point source and is randomly scattered by an ensemble of particles is found to form an image of the point source. Results are presented for light which is emitted from a 25 micrometer pin hole and is then scattered by a suspension of .296 micrometer polystyrene spheres. This phenomenon is interpreted in terms of coherent multiple backscattering. The present study investigates the effects of particle density on the image resolution.
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