Abstract Silver halide phase holograms stabilized to radiation at selected wavelengths are prepared by exposure of silver halide photographic emulsion plates to laser radiation at preselected wavelengths to form a holographic pattern of metallic silver in said emulsion, developing said photographic emulsion plate, converting residual silver to silver halide by conventional bleaching processes, and dyeing the bleached hologram with an organic dye to desensitize the silver halide against decomposition by radiation at the preselected wavelengths without substantial absorbtion of the radiation at that wavelength. Stabilization of bleached silver halide holograms to argon ion laser radiation at 4,880 and 5,145 angstroms is disclosed.
A process according to claim 1 wherein silver halide formed in step (c) is silver bromide.
Claim 2
Dependent Claim
21 words
A process according to claim 1 which also includes the step of treating the bleached hologram with an oxidizing agent bath.
Claim 3
Dependent Claim
21 words
A process according to claim 1 wherein the negative is treated with cupric bromide to form a silver bromide bleached hologram.
Claim 4
Dependent Claim
29 words
A process according to claim 1 wherein the picric acid is applied from a methanol solution bath having a picric acid concentration of at least 3 parts per 10,000.
Claim 5
Dependent Claim
62 words
A process for desensitizing bleached silver halide holograms formed from silver halide photographic plates by exposure to holographic radiation having a wavelength of 515 nm which comprises dyeing the bleached plate with a dye bath containing picric acid at a concentration of 10 2 to 10 3 parts to desensitize the silver halide in said hologram to radiation of the same wavelength.
Claim 6
Dependent Claim
72 words
A desensitized silver halide phase hologram comprising a photographic plate having a transparent substrate, a gelatin emulsion on a surface of said substrate and silver halide particles distrIbuted throughout said emulsion in a holographic pattern and picric acid adsorbed on said silver halide particles which dye transmits laser radiation at a wavelength of 515 nm and concomitantly retards photolytic degradation of said silver halide to metallic silver by radiation of said wavelength.