Gas phase hardening of gelatin holograms
AssigneeHughes Aircraft Company
InventorJohn E. Wreede
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Abstract
A process for hardening gelatin holograms after dehydration involving subjecting the hologram to an atmosphere containing aldehyde vapor and water vapor. The process provides hardening of the gelatin hologram to increase resistance to moisture and heat without adversely affecting diffraction efficiency. Monitoring of the diffraction efficiency during the aldehyde-water vapor treatment allows fine tuning of the hologram efficiency and evenness.
Claims18
A process for hardening gelatin holograms after dehydration and removing the dehydration agent comprising the step of treating a dehydrated hologram with a sufficient amount of aldehyde vapor along with and in the presence of a sufficient amount of water
- vapor and for a sufficient time to harden said dehydrated hologram.
A process for hardening gelatin holograms according to claim wherein the concentration of aldehyde vapor in the atmosphere surrounding said dehydrated hologram is between about 5 to 20 volume percent.
In a process for making a gelatin hologram which includes the steps of dehydrating the gelatin hologram in alcohol after development of the gelatin hologram and then removing the alcohol from the gelatin to provide an alcohol evaporated gelatin hologram, wherein the improvement comprises treating said alcohol-evaporated gelatin with a sufficient amount of aldehyde vapor along with and in the presence of a sufficient amount of water vapor and for a sufficient time to harden said alcohol evaporated gelatin hologram.
Dependencies are inferred from the claim text.