| 摘要 |
<p>There is described holographic material which comprises coated on a photographic supporting base at least one silver halide emulsion which has a mean grain size of less than 0.1 mu m and at least one emulsion of which has been optically sensitised with at least one green sensitising dye of the following general formula I : <CHEM> wherein R1 is an optionally substituted alkyl group, R2 is hydrogen or an alkyl group having 1 to 6 carbon atoms and D represents the atoms needed to complete an optionally substituted 5- or 6- membered heterocyclic ring and at least one emulsion of which has been optically sensitised with at least one red sensitising dye of the general formula II :- <CHEM> wherein R1 is an alkyl group having 1 to 4 carbon atoms, R2 and R3 are each hydrogen, alkyl groups having 1 to 4 carbon atoms or aryl, R4 is an optionally substituted alkyl group and Y represents the atoms necessary to complete a benzothiazole or benzoselenazole nucleus, the benzene ring of which is optionally substituted. The silver halide emulsion used in the holographic material of the present invention can be used to produce a record of a holographic exposure which has been made using a laser which emits in the blue, green or red regions of the spectrum. If three exposures are made to the three regions of the visible spectrum a record of all three exposures can be obtained.</p> |
