Hologram record by means of film anisotropy photoinduction

Abstract

The diffraction efficiency of a hologram in crossed polarizers, recorded by means of photoinduction of the optical anisotropy in a film with a different orientation of the polarization planes of interfering plane waves, is studied. The dependence between the diffraction efficiency of the hologram and the angle of orientation against the optical axis of the analyzer is determined both theoretically and experimentally. The theoretical calculations are based on the assumption that the photoinduction of anisotropy is due to the formation of anisotropic grains following exposure to light and only the concentration of grains is a function of exposure. The experimental results, referring to azo-dye-colored films, are in good agreement with the theoretical results of the given work.

Gelatin as Photosensitive Material

“…This is called polarization holography. The group of Prof. Ebralidze (Georgia) [19][20][21][22][23] developed a technique where they used dyed gelatin to record polarizing holograms. Azo-dye-colored gelatin films (methyl-orange, methyl-red, and other dyes) were prepared on glass plates.…”

Three-Dimensional Vector Holograms in Photoreactive Anisotropic Media

“…These properties make polarization gratings useful for numerous optical applications related to polarization discrimination (Davis et al, 2001;Asatryan et al, 2004), control (Nikolova et al, 1997;Hasman et al, 2002), and measurement (Gori, 1999;Provenzano et al, 2006). Polarization gratings can be fabricated by holographic exposure with polarized interference light in photoanisotropic media such as azobenzene-containing polymer (azopolymer) films Ebralidze et al, 1992;Huang and Wagner, 1993;Samui, 2008). Since azobenzene molecules reorient in accordance with polarization of light resulting from trans-cis-trans photoisomerization reactions, periodic structures are formed as spatial distribution of the molecular orientation by holographic recording using vectrial light (i.e., by vector holography).…”

Effects of recording wavelength on three-dimensional vector holograms in photoreactive liquid crystal composites

“…Holographic recordings of polarization gratings in photosensitive anisotropic organic materials have been widely studied [1][2][3][4][5][6][7][8][9][10][11][12]. The interest is mainly due to their unique optical properties, including polarization selectivity of the diffraction efficiency and polarization conversion in the diffraction process [3][4][5][7][8][9][10][11][12][13][14][15].…”

“…These properties make polarization gratings useful for numerous applications related to polarization control, measurement, and discrimination. Most of the work on the holographic polarization gratings has dealt with azobenzene-containing polymer systems as the recording media [1][2][3][4][5][6][7][8]12]. Since azobenzene molecules can reorient in accordance with polarization of light resulting from transcis-trans photoisomerization reactions, polarization gratings are created as spatial distributions of the molecular orientation by polarization holographic recordings.…”