5(Y2 isopropanol-50% water mixture, 50 C,Ħ. 5(FA isopropanol-50% water mixture, 22 C,Ĭ. Develop with agitation in the following solutions:ī. A gentleĪir flow may be used to facilitate drying.ĥ. Dry in the dark at room temperature at 20 toĨ0% relative humidity for 2 to 4 hours. 0.2 M ammonium dichromate (Malinckrodt,Ĭ. Room temper~iture in a solution containingĪ. hnmers the dry gelatin layer for 10 minutes at Prevent the gelatin from dissolving in subsequentĢ. Kodak Rapid Fixer or a small antount of ammonium dichromate as described by Brandes et al. Substrate and preharden the gelatin with either or by casting a gelatin solution on a glass Prepare a gelatin layer 5 to 30/lm thick eitherīy bleaching Kodak 649F photographic plates To date, the best procedure that we have found consists of the followingġ. Severn modifications of the procedure were necessitated for optimum results. The use of another triphenylmethane dye, Acidīlue 3, in place of AFV extends the red sensitivity toĪlthough the techniques for preparing dye sensitized DCG plates have some similarities to techniques used for preparing conventional DCG plates, Thick film containing 4 X 10 4 M AFV would, forĮxample, absorb about 3% of incident H e - N e laser The molar extinction coefficient of AFV isĪbout 32,000 liter mole 1 cm 1 at 633 nm. 1Ĭompares the absorption spectra of ammonium dichromate, the active absorbing species in DCG, andĪFV.
In particular, Acid Fast Violet BG (AFV) has a solubility product greater than 10 - 4 mole 2 liter -2. Fhese dyes show muchīetter compatibility with dichromate solutions, and, Scribes the use of these dyes in a procedure for theĬolor sensitization of DCG for recording relief images (dashed line) and 10 -s M acid fast violet BG dye (solid line) Absorption spectra of 0.002 M ammonium dichromate Triphenylmethane dyes, and they were found to be Īcceptable spectral sensitizers for DCG. We also investigated another class of dyes, the For example, if methylene blue dye is used, less than 0.05% of incidentĦ33 nm light would be absorbed in a 10/Ira thick Since most dichromate sensitizing solutions are at least 0.2 M, onlyġ0 -5 M dye could be used, resulting in very lightĬoupling into the gelatin layer.
In dichromate solutions, typically having solubility Thiazine dyes are unsuitable since they precipitate in Of DCG with thiazine dyes was reported by Oster and The thiazine and triphenyl methane, are capable of In our studies we have found that two dye families, Letter describes a method for extending the sensitivity for holographic recording throughout the visible Spectral sensitivity of this material is generally limited to wavelengths of 520 nm or less. Speed, its sensitivity at 325 nm, and the mechanism of image formation. Low noise have stirred considerable interest, and severn recent investigations have probed into optimizhag its use at 488 nm, improving its photographic Useful properties of DCG of high diffraction efficiency and Hologram recording material since its practicability was demonstrated by Shankoff. The sensitivity ofĭye sensitized dichromated gelatin at 633 nm is about five times less than of dichromated gelatin at 488 nm.ĭichromated gelatin (DCG) has been a popular This material has excellent resolution, and refractive index changes up to 0.02 have been observed. We have found that phase holograms can be recorded with He-Ne laser light in dye sensitized dichromated gelatin.
Hughes Research Laboratories, Malibu, California 90265, USA IN D Y E S E N S I T I Z E D D I C H R O M A T E D
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