Optical: systems and elements – Holographic system or element – Fourier transform holography
Patent
1998-07-10
2000-12-19
Chang, Audrey
Optical: systems and elements
Holographic system or element
Fourier transform holography
359 30, 359 10, 359559, G03H 116, G03H 100, G03H 110
Patent
active
061633917
ABSTRACT:
We disclose apparatus for holographic recording of information. The apparatus includes a lens or lens system, referred to here as the "FT lens," situated in such a way that light from an object beam enters the FT lens after passing through an object, and light leaving the FT lens impinges on a recording medium situated at a Fourier transform plane of the object with respect to the FT lens. In certain aspects of the invention, the apparatus includes a phase element effectively juxtaposed with the object, the phase element is effective for redistributing object-beam intensity in the Fourier transform plane, and the phase element has a correlation length greater than a maximum pixel side length associated with the object. In certain other aspects of the invention, the apparatus includes an optical element or optical system, referred to here as a "power optic," that adds convergence or divergence to the object beam before the object beam enters the FT lens.
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Burckhardt, C.B. "Use of a random Phase Mask for the Recording of Fourier Transform Holograms of Data Masks", Applied Optics vol. 9, No. 3, pp. 695-700.
Curtis Kevin Richard
Mitra Partha Pratim
Tackitt Michael C.
Chang Audrey
Finston Martin I.
Lucent Technologies - Inc.
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