Method of producing stable holograms in dichromatic gelatin
AssigneeHughes Aircraft Company
InventorsJohn E. Wreede, James E. Scott
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Abstract
A method of developing a holographically recorded interference pattern in a dichromatic gelatin structure is provided. The process includes developing the hologram pattern by hydration and dehydration, baking the developed hologram pattern at a temperature equal or above 120.degree. C. for approximately 24 hours, rehydrating the developed hologram and dehydrating the developed hologram at a temperature of approximately 60.degree. C. for approximately 48 hours until the design wavelength response is attained to provide a stabilized hologram.
Claims17
A method of developing a holographically recorded interference pattern in a dichromated gelatin and the like, comprising the steps of:
- developing the hologram pattern in the dichromated gelatin by contact with predetermined liquids,
- heating the developed hologram pattern after removal from the liquids;
- redeveloping of the heated hologram pattern by contact with predetermined liquids, and
- reheating the redeveloped hologram pattern until a predetermined wavelength response is achieved whereby a stabilized hologram is produced in a relatively short time period.
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of:
- developing the hologram pattern by hydration and dehydration of the dichromated gelatin;
- initially baking the developed hologram pattern at a temperature above the softening temperature of the gelatin for an initial time period until a predetermined wavelength response is achieved;
- redeveloping by hydrating the initially baked hologram;
- redeveloping by dehydrating the initially baked hologram, and
- baking the redeveloped hologram a second time at a temperature less than the initial baking temperature until a stable hologram having a desired wavelength response is produced.
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of:
- developing the hologram pattern by hydration and dehydration of the dichromated gelatin;
- initially baking the developed hologram pattern at a temperature above the softening temperature of the gelating until a predetermined wavelength response about a desired wavelength is achieved;
- redeveloping by hydrating the initially baked hologram;
- redeveloping by dehydrating the initially baked hologram, and
- baking the redeveloped halogram a second time at a temperature less than the initial baking temperature until the desired wavelength response is achieved.
A method of developing a holographically recorded interference pattern in a dichromated gelatin comprising the steps of:
- developing the hologram pattern by hydration and dehydration of the dichromated gelatin, at a temperature of approximately 20.degree. C.;
- baking the developed hologram pattern at a temperature approximately equal to or above 120.degree. C. until a predetermined wavelength response from a design wavelength is achieved;
- redeveloping by hydrating the baked hologram at a temperature of approximately 60.degree. C.;
- redeveloping by dehydrating the baked hologram at a temperature of approximately 60.degree. C.;
- and
- baking the redeveloped hologram a second time at a temperature of approximately one-half the initial baking temperature until a predetermined wavelength response is achieved.
Dependencies are inferred from the claim text.