Accession Number : ADA019320

Title :   The Production of Dichromated Gelatin Emulsions for Recording Phase Holograms.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Marcroft,David A.

Report Date : DEC 1975

Pagination or Media Count : 74

Abstract : An experimental study was made to determine the optimum procedures for making dichromated gelatin plates suitable for creating phase holograms. It was determined that a 0.5mm thick coating of 3% gelatin solution (by weight) resulted in a dry film thickness of 10 micrometers. A procedure for allowing the gelatin solution to solidify on a level plate at room temperature was used to coat the flat glass plate. This procedure was found to give excellent gelatin films which were then hardened in Kodak Rapid-Fixer and sensitized with a 5% solution of ammonium dichromate (by weight). The plates were then dried prior to exposure. Plane wave gratings were created in the sensitized gelatin using 5145 A light as a test of the processing procedures. It was found that during periods of high humidity, the diffraction efficiency continued to change after the exposure was stopped. This changing diffraction efficiency before processing was found to have some relationship to the amount of hardness of the water content of the plates. No precise relationship for these factors was determined.

Descriptors :   *Holography, *Photographic emulsions, Photographic recording systems, Ammonium compounds, Chromates, Photographic processing, Gelatins, Diffraction gratings, Theses

Subject Categories : Holography

Distribution Statement : APPROVED FOR PUBLIC RELEASE