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Materials for Holographic Optical Elements and Optical Memories

IP.com Disclosure Number: IPCOM000046296D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Burland, DM: AUTHOR [+2]

Abstract

The solid-state photochemistry of N-methyl diphenylamine (MDPA) has been investigated. This compound undergoes the following reactions: (Image Omitted)

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Materials for Holographic Optical Elements and Optical Memories

The solid-state photochemistry of N-methyl diphenylamine (MDPA) has been investigated. This compound undergoes the following reactions:

(Image Omitted)

MDPA undergoes the above adiabatic photocyclization reaction in the triplet state to yield a zwitterionic transient species (Z) with a broad unstructured absorption band at 610 nm. In solution, Z is oxidized to MC. The thermal formation of MC competes with photochemical and thermal ring-opening reactions that lead back to the parent amine.

Experiments have been performed with films of MDPA in a poly(methylmethacrylate) (PMMA) host. The results indicate that the photochemical behavior of MDPA in this rigid matrix is very similar to what has been observed in liquid solutions. Irradiation with UV light from a Hg lamp leads to the formation of MC in high chemical yield (about 50%). The course of this reaction has been followed by monitoring the absorption spectrum. Marked isosbestic points indicate a clean conversion of reactant to product. Additional illumination with red (647 nm) light from a Kr laser inhibits the formation of MC, as could be seen from the lack of MC fluorescence from the spots hit by the laser beam. These spots became fluorescent after the red light was blocked.

Two-photon holographic recording has been demonstrated by writing a holographic grating into the film using 647 nm light from a Kr laser in conjunction with a Hg lamp. Efficien...