| 摘要 |
1291673 Processing holograms INTERNATIONAL BUSINESS MACHINES CORP 19 April 1971 [20 April 1970] 24629/71 Heading G2C The optical diffraction stability of laser interrogated holograms which have been developed by an etch-bleach process from silver halide gelatin media is improved by treating the hologram with a solution of a gelatin hardening agent comprising a dichromate/chloride solution or a formaldehyde solution. The hardening treatment may be followed by heating in air, vacuum, helium or nitrogen and may be preceded by a U/V exposure.
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