Abstract

Gelatin films ~20 μm thick have been used to record infrared interference patterns. These films were glued to an O-ring so that at exposure time only the radiation contributing to form the interference pattern interacts with the gelatin. This situation is not present when most of the materials mentioned in the literature are used because they need a substrate that reflects IR radiation at exposure time and degrades the interference pattern. Behavior of transmittance (in the mid-IR region) as a function of gelatin thickness has been found with a spectrometer. To characterize the film as a holographic recording medium, interferometric studies which comprise the recording of interferometric gratings have been done. These studies show the behavior of the diffraction efficiency for visible red light (632.8-nm wavelength) as a function of time having as a parameter the film thickness, the spatial frequency of the interference pattern, and the exposure time.

© 1987 Optical Society of America