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Chromatic Optical System for Holographic Imaging

IP.com Disclosure Number: IPCOM000074514D
Original Publication Date: 1971-May-01
Included in the Prior Art Database: 2005-Feb-23
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Katyl, RH: AUTHOR

Abstract

Elimination of image center shaft, occurring in holographic imaging when using broadband light, is achieved by structuring two diffractive elements at a certain ratio of carrier frequencies which causes one of the elements to cancel out the image center shift or deviation, produced by the other element.

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Chromatic Optical System for Holographic Imaging

Elimination of image center shaft, occurring in holographic imaging when using broadband light, is achieved by structuring two diffractive elements at a certain ratio of carrier frequencies which causes one of the elements to cancel out the image center shift or deviation, produced by the other element.

The first element is a hologram with given parameters, one of which is the reference beam angle, Thetar1. The second element is a zone plate structured with the parameters required for chromatic aberration compensation, but having a reference beam angle Thetar2. As shown, the hologram H and zone plate ZP are employed in an optical system in which broadband light, incident upon the hologram at the angle Thetar1 produces an image beam issuing from the virtual image point I located a distance Z(o) from the Hologram H and a distance X1 above the optical axis of the system. The required constraint to obtain the desired invariant spatial position Z2, X2 of the image center is determined in accordance with an expression, in which Thetar2 and Thetar1 are the critical reference beam angles previously mentioned Z(o) the object distance when the hologram was recorded, alpha the separation distance between the elements, and Mu the relative wavelength.

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