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Valentin P3herstYuk, AIxandr NMa1ov, SrY MMa1otov, VYachs1av V. Kalinkin L. V. Pisarzhevsky Institute of Physical Ch@mistry of th TJkra.inian SSR Acad@my of Sciences, ProsPkt Nauki 31, Kiev 252O28 Ukrainian SSR ABSTRACT The optical information recorded in dichromate gelatin (DCG) layers Induced the information of a latent. image Which rnder the action of water and alcohols transforms to a relief or Phase image.

Nonlinear refraction in a new polymer material based on diglycidylether of bisphenol-A and containing 4-aminoazobenzene covalently attached to the polymer chains have been studied. The material was shown to exhibit fast nonlinear response (relaxation time about 20 ns, χ(3)= 5 × 10- 8 esu) together with slow one (relaxation time of the order of tens of hours). This makes it possible to record fast and long life (quasi stationary) phase holograms. An analysis of possible mechanisms for the refractive index nonlinear behavior in the new structure is presented. In particular, a role of electronic, thermal, orientation, and isomerization processes is discussed. It was for the first time shown that the rotational and inversion mechanisms of the cis → trans isomerization of the azo-compounds have determinative effect upon kinetics of the nonlinear refractive index relaxation. For the rotational mechanism the relaxation time was found to be 10-4 s meanwhile for the inversion mechanism it was 105 s.