Method and apparatus for dehydrating dichromatic gelatin holograms
AssigneeHughes Aircraft Company
InventorsJohn E. Wreede, James E. Scott
Life of this patent
Estimating the term…
Abstract
A method of manufacturing optical elements, such as for head-up displays, from holographically recorded interference patterns in a dichromatic gelatin is disclosed. The exposed hologram pattern is developed through hydration, the hydrated hologram gelatin is dehydrated by contacting the hydrated gelatin with a mixture of isopropyl alcohol and an inert anhydrous fluid, such as a liquid fluorinated hydrocarbon solution. The dehydrated hologram pattern can then be subsequently stabilized, for example, by baking.
Claims19
In a method of developing a holographically recorded interference pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising:
- contacting the hydrated gelatin with a mixture of alcohol and a liquid fluorinated hydrocarbon solution to dehydrate the dichromated gelatin.
In a method of manufacturing optical elements from holographically recorded interference patterns in a dichromated gelatin comprising, the steps of:
- developing the hologram pattern by hydration;
- dehydrating the hydrated hologram gelatin by contacting the hydrated gelatin with a mixture of alcohol and a liquid fluorinated hydrocarbon solution, and
- stabilizing the dehydrated hologram pattern in the gelatin by baking.
In a method of developing a holographically recorded interference pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising:
- contacting the hydrated gelatin with a mixture of alcohol and an inert anhydrous liquid solution to dehydrate the dichromated gelatin.
In a method of developing a recorded pattern in a dichromated gelatin that has been initially subjected to a hydration bath and will be subsequently stabilized, the improvement of dehydration, comprising:
- contacting the hydrated gelatin with a plurality of baths which include alcohol and, at least the last one of the baths includes a liquid fluorinated hydrocarbon all in a solution to dehydrate the dichromated gelatin.
Dependencies are inferred from the claim text.