Browse Prior Art Database

Wide Angle Holography

IP.com Disclosure Number: IPCOM000091777D
Original Publication Date: 1968-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Sincerbox, GT: AUTHOR

Abstract

The angular field of view of a hologram is increased in this arrangement without increasing the physical size of the storage medium. Recording medium 1, drawing A, is positioned to record the interference pattern created due to the interference of information bearing beam of light 2 and reference beam 3. Beam 2 is modulated by three-dimensional object 4. The angular field is divided into segments by employing mirror 5, positioned adjacent and substantially at right angles to medium 1. Portion 6 of beam 2 interferes directly at medium 1 with beam 3. Another portion 7 of beam 2 strikes mirror 5 and is reflected to interfere with beam 3 at medium 1. The latter is positioned in the overlap region of portions 6 and 7 so that both angular fields are recorded simultaneously.

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Wide Angle Holography

The angular field of view of a hologram is increased in this arrangement without increasing the physical size of the storage medium. Recording medium 1, drawing A, is positioned to record the interference pattern created due to the interference of information bearing beam of light 2 and reference beam 3. Beam 2 is modulated by three-dimensional object 4. The angular field is divided into segments by employing mirror 5, positioned adjacent and substantially at right angles to medium 1. Portion 6 of beam 2 interferes directly at medium 1 with beam 3. Another portion 7 of beam 2 strikes mirror 5 and is reflected to interfere with beam 3 at medium 1. The latter is positioned in the overlap region of portions 6 and 7 so that both angular fields are recorded simultaneously.

In the image reconstruction process of drawing E, storage medium 8, after processing, is positioned in the path of interrogating beam 9. Mirror 10 is positioned adjacent and substantially at right angles to medium 8. On incidence of beam 9 at medium 8, the reconstructed wave fronts 11 and 12 travel in different directions but are combined into one complete field by mirror 10. The angular field for the size of storage medium employed in conventional recording is indicated by wavefront 11. The increase in angular field by this method of recording is indicated by wavefront 12. A virtual image of the recorded three- dimensional object appears in space at 13.

A second mirror reflect...