Abstract

Gelatin films glued to an O-ring are proposed as a new procedure to record interference patterns when a CO2 laser is used as an infrared light source. With this method the unwanted effects given by a substrate, on which the thin recording film is laid, are avoided. To characterize the medium, interferometric studies including the recording of diffraction gratings have been done. Diffraction efficiencies of ~30% have been obtained when coherent red light (0.6328-μm wavelength) was sent normally to the gratings. An example of an infrared recorded hologram is shown.

© 1988 Optical Society of America

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