Recently much attention has been given to the development of new sensitive media based on polymers and copolymers for holographic recording [1-4]. The advantages of polymeric recording media are low cost, ease of manufacturing and deposition of the thin films which are not demanding heats, vacuum or special requirements. A lot of interest was caused by the discovery of photoconductivity in carbazole-containing polymers. The ongoing peak of interest is connected mostly with the discovery of polymeric recording media, organic photorefractive materials and polymeric emitting diodes. With the purpose of improvement of recording parameters of such materials in the present work authors carried out a cycle of researches on registration on synthesized polymer polyepithiopropylcarbazole plasticized with glycidyl butyrate. All investigated polymers contained iodoform as a photosensitizer. The dependence of photosensitivity of the deposited films on the content of iodoform was studied. Photoresistive media were applied on optical transparent substrates with varied thickness of layers from 1,0 up to 3,0 μm. Optical properties of photoresistive polymer films were investigated by spectrophotometer measurements. To analyse photoinduced variations of optical properties, the films understudy were exposed to UVirradiations of the ultraviolet quartz lamp PRK-4 (Е=3.3 mW/cm2) with the cutting visible and infra-red filter (UFS-5) and Ar+ laser (λ =488 nm, H=54 J/cm2). Diffraction gratings were recorded by means of Ar laser (λ=488 nm) at recording density 1000 mm-1. Optimum time of registration was fixed by means of computer with achievement of maximum diffraction efficiency (DE). Etching of samples was carried out in organic solvent carbon tetrachloride. DE of etched samples were measured in transmission mode by red laser beam (λ=633 nm). The maximum obtained values of DE on polyepithiopropylcarbazole plasticized with glycidyl butyrate composition made up to 40% at recording density of 1000 mm-1. It is obvious that such comparative high value of DE is caused by feature of a received diffraction grating’s relief. It is known that theoretically achievable value of DE of the diffraction grating recorded with sinusoidal profile recorded in a thin film makes 33%. It is probable that feature of etching of the investigated material polyepithiopropylcarbazole is plasticization with glycidyl butyrate. The profile of the diffraction grating after etching is presented on Fig. The morphology of etched samples was studied using the Atomic Force Microscopy NANOStation II. This work was supported by Project no. 09.836.05.01A “Structuri compozite la scară nanometrică în baza materialelor organice/anorganice pentru dispozitive luminescente şi structuri difracţionale” in the framework of the National Programme “Nanotehnologies and nanomaterials”.