Tariel Ebralidze

Consideration is given to the action of azo-dye temperature on Weigert’s effect. Azo-dye-colored gelatin emulsions, on heating, have been found to show an increase both in the anisotropy photoinduction rate and in the magnitude of saturation anisotropy.

Anisotropic grains have been shown to be spontaneously induced in films that have been oversaturated and overcooled with dye in which Weigert’s effect can be observed. Some of the grains exposed to active linearly polarized light are destroyed with the result that the film becomes anisotropic.

Consideration is being given to Weigert’s effect in dyes, whereby a film image is produced. As in silver emulsion, trough grain distribution, with the only difference that the grains here are anisotropic. Their optical axes are aligned with the polarization vector of anisotropy- inducing light. Cnsophenine dye tests have shown an initiation of Weigert’s effect both by grain photoinduetion and by photodestruc'rion of spontaneously induced grains. Considering such a film as an analog of translueent plate, the relevant Jones matrix has been determined. Relying on this matrix, the properties of linearly polarized plan wave hologram based on the initiation of Weigert's ejfect in dye have been investigated. The conditions have been ascertained wherein a polarization hologram could be obtained and the diffraction efiiciency of this hologram has been determined.

In the course of slow evaporation of an azo-dye chrysophenine-saturated gelatin-water solution, dye crystals that developed two different interference colors were observed in the gelatin; the colors were yellow and blue. The crystals that produce a blue interference color undergo disintegration on exposure to non-polarized light from a mercury lamp.

Upon massive generation of anisotropic grains of azo dye methyl orange in a gelatin film exposed to active polarized light, a cluster of micro crystals with optical axes of similar orientations has been produced. The anisotropy observed has been found to disappear under exposure to active natural light.

A series of tests have been performed involving anisotropy photoinduction in Rhodamine 6G-dyed gelatin film. A film with photoinduced anisotropy has been shown to be characterized by photochromism. The dichroism of the dye molecule aggregates has been investigated.

During the mass formation of aggregates of molecules in a gelatin film dyed with the mixture of chrysophenine and acridine yellow dyes, photo-reorientation, photo-disorientation, and photo-orientation of the molecules are observed. Based on these observations, the photo-induction of granular aniso tropy may be realized.

By using the video microscopy, the picture of the formation of anisotropy photoinduction in the form of grains in time is shown, when anisotropy in the film is induced in individual micrograins and the concentration and sizes of the grains are modulated depending on the light exposition. This phenomenon was observed in the gelatin film dyed with the mixture prepared with the saturated solutions of Chrysophenine and Acridine Yellow mixed with 1 : 1 proportion.