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TWO PHOTON WRITING OF HOLOGRAPHIC OPTICAL ELEMENTS FOR THE INFRARED

IP.com Disclosure Number: IPCOM000025969D
Original Publication Date: 1989-Jun-30
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 54K

Publishing Venue

Xerox Disclosure Journal

Abstract

A holographic optical element is Formed by using a desired reconstruction wavelength (7500 Angstroms or greater) in a holographic exposure and using uniform illumination at a shorter, activating, wavelength to supply the higher photon energies needed to generate the required photochemistry for hologram formation. The forming process involves using the desired final wavelength to form the optical wavefront desires (i.e. a diverging spherical wave to form a spherical lens) with a reference wave (i.e. a planar wave front) to interfere in a recording medium. The generated interference pattern in the storage media will not initiate the required photochemistry to write the holographic optical element unless the visible or ultraviolet light is present in a uniform illumination of the holographic storage medium. When the object and reference wave and the activating light are present simultaneously, the hologram is formed with the spatial frequencies and curvature required for efficient and abberation-free use at the infrared writing wavelength.

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XEROX DISCLOSURE JOURNAL

TWO PHOTON WRITING OF HOLOGRAPHIC OPTICAL ELEMENTS U.S. C1.350/3.67 FORTHE INFRARED
John R. Andrews

Proposed Classification

Int. C1. G03h 1/10

A holographic optical element is Formed by using a desired reconstruction wavelength (7500 Angstroms or greater) in a holographic exposure and using uniform illumination at a shorter, activating, wavelength to supply the higher photon energies needed to generate the required photochemistry for hologram formation. The forming process involves using the desired final wavelength to form the optical wavefront desires (i.e. a diverging spherical wave to form a spherical lens) with a reference wave (i.e. a planar wave front) to interfere in a recording medium. The generated interference pattern in the storage media will not initiate the required photochemistry to write the holographic optical element unless the visible or ultraviolet light is present in a uniform illumination of the holographic storage medium. When the object and reference wave and the activating light are present simultaneously, the hologram is formed with the spatial frequencies and curvature required for efficient and abberation-free use at the infrared writing wavelength.

Volume 14 Number 3 May/June 1989 117

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May/June 3 Number 14 Volume XEROX I 118 DISCLOSURE JOURNAL 1989

[This page contains 1 picture or other non-text object]