Improvement of the technology for manufacturing relief holographic gratings on dichromated gelatin irradiated with short-wave UV radiation

Abstract

A new variant of manufacturing high-frequency holographic gratings with a spatial frequency up to 1500 mm-1 on layers of dichromated gelatin (DCG), in the processing technology of which water procedures are completely excluded, is proposed. The method is based on the use of glacial acetic acid after the photodestruction of layers by exposure to short-wave UV radiation instead of the standard method of processing holographic structures registered by coherent He-Cd laser radiation. In the course of the experiments, relief-phase holographic gratings with high diffraction efficiency up to 64% were obtained, regardless of the thickness of the DCG layers. Keywords: holographic diffraction gratings, dichromated gelatin, short-wave UV radiation, surface relief, diffraction efficiency, glacial acetic acid, isopropanol.