Browse Prior Art Database

Process for Fabricating Dichromated Gelatin Holograms on Plastic Substrates

IP.com Disclosure Number: IPCOM000044500D
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Chow, BL: AUTHOR [+3]

Abstract

This article discloses a process for fabricating a dichromated gelatin hologram layer on a plastic substrate. The process does not require a subbing layer between the hologram layer and the plastic substrate. A light-sensitive photosensitive emulsion applied directly to the surface of a plastic substrate does not normally have enough adhesion for most photographic end uses. As a result, one or more subbing layers have conventionally been applied between the plastic substrate and the photosensitive emulsion. The major drawback using the chemical subbing technique is that the subbing layer can be grainy and non-uniform in thickness, resulting in high scattering noise during exposure and phase errors in transmitted light.

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Process for Fabricating Dichromated Gelatin Holograms on Plastic Substrates

This article discloses a process for fabricating a dichromated gelatin hologram layer on a plastic substrate. The process does not require a subbing layer between the hologram layer and the plastic substrate. A light-sensitive photosensitive emulsion applied directly to the surface of a plastic substrate does not normally have enough adhesion for most photographic end uses. As a result, one or more subbing layers have conventionally been applied between the plastic substrate and the photosensitive emulsion. The major drawback using the chemical subbing technique is that the subbing layer can be grainy and non- uniform in thickness, resulting in high scattering noise during exposure and phase errors in transmitted light. An acceptable dichromated holographic element can be fabricated on a hydrophobic plastic (polycarbonate) substrate by a process which includes the steps of: a) cleaning the substrate with a soap solution at room temperature; b) rinsing the substrate thoroughly; c) drying the substrate at room temperature in a clean atmosphere; d) treating the substrate in a plasma chamber filled with oxygen; e) coating the substrate with a photosensitive (dichromated gelatin) solution using standard techniques; f) exposing the photosensitive layer to an actinic interference pattern to record a latent image thereon; g) developing the photosensitive layer; and h) laminating a clean cover pla...