US3608992A
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Multiplex holography with tresnel diffraction pattern coded reference beans
Assignee: NCR Voyix Corp
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Filing: 1970-06-18
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Granted: 1971-09-28
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Expires: 1990-06-18
Abstract
Abstract The present invention relates to a method of forming and utilizing a hologram by placing a Fresnel diffraction pattern and a Fourier transform lens in the reference beam during the formation of the hologram. An object pattern is placed in the object beam. A hologram of the near field or the far field of the object beam is formed by interfering the object beam and the reference beam at a recording medium in the focal plane of the Fourier transform lens. A reconstruction of the object pattern is produced from the hologram by passing the reference beam through the Fresnel diffraction pattern, the Fourier transform lens, the hologram, and a reconstruction lens.
Inventors
- 👤 Robert A Phelps
- 👤 Thomas J Negrelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:53
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/04; G03H1/16; G03H1/26; G03H1/2645; G03H2001/2675; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
116 words
A method of forming a hologram in a recording medium and for reconstructing an image thereof comprising: a. directing an object beam through an object pattern; b. directing a reference beam through a photographic recording of a Fresnel diffraction pattern of an encoding pattern; c. directing the reference beam issuing from the Fresnel diffraction pattern of an encoding pattern through a Fourier transform lens; and d. directing said object beam issuing from the object pattern and said reference beam issuing from the Fourier transform lens onto said recording medium which is at the focal plane of said Fourier transform lens to form a hologram of the object beam and the reference beam in the recording medium.
Claim 2
Independent Claim
116 words
A method of forming a hologram in a recording medium and for reconstructing an image thereof comprising: a. directing an object beam through an object pattern; b. directing a reference beam through a photographic recording of a Fresnel diffraction pattern of an encoding pattern; c. directing the reference beam issuing from the Fresnel diffraction pattern of an encoding pattern through a Fourier transform lens; and d. directing said object beam issuing from the object pattern and said reference beam issuing from the Fourier transform lens onto said recording medium which is at the focal plane of said Fourier transform lens to form a hologram of the object beam and the reference beam in the recording medium.
Claim 3
Independent Claim
139 words
A method of forming a hologram in a recording medium and for reconstructing an image comprising: a. directing an object beam through an object pattern; b. directing a reference beam through a photographic recording of a Fresnel diffraction pattern of an encoding pattern; c. directing the object beam issuing from the object pattern through a first Fourier transform lens; d. directing the reference beam issuing from the Fresnel diffraction pattern of an encoding pattern through a second Fourier transform Lens; and e. directing said object beam issuing from the first Fourier transform lens and said reference beam issuing from the second Fourier transform lens onto said recording medium, which is at the focal plane of both of said Fourier transform lenses, to form a hologram of the focused object beam and the focused reference beam in the recording medium.
Claim 4
Independent Claim
139 words
A method of forming a hologram in a recording medium and for reconstructing an image comprising: a. directing an object beam through an object pattern; b. directing a reference beam through a photographic recording of a Fresnel diffraction pattern of an encoding pattern; c. directing the object beam issuing from the object pattern through a first Fourier transform lens; d. directing the reference beam issuing from the Fresnel diffraction pattern of an encoding pattern through a second Fourier transform Lens; and e. directing said object beam issuing from the first Fourier transform lens and said reference beam issuing from the second Fourier transform lens onto said recording medium, which is at the focal plane of both of said Fourier transform lenses, to form a hologram of the focused object beam and the focused reference beam in the recording medium.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein the recited steps are successively carried out a plurality of times to form a plurality of holograms in said recording medium.
Claim 6
Dependent Claim
27 words
The method of claim 2 wherein the recited steps are successively carried out a plurality of times to form a plurality of holograms in said recording medium.
Claim 7
Dependent Claim
54 words
The method of claim 2 including a step of directing a reconstruction beam successively through the Fresnel diffraction pattern of the encoding pattern which is used to encode the hologram, through a Fourier transform lens, through said encoded hologram and through another Fourier transform lens, to reconstruct said object pattern from said recording medium.
Claim 8
Dependent Claim
52 words
The method of claim 1 including a step of directing a reconstruction beam successively through the Fresnel diffraction pattern of the encoding pattern which is used to encode the hologram, through a Fourier transform lens, through said encoded hologram and through an imaging lens, to reconstruct said pattern from said recording medium.
Claim 9
Dependent Claim
54 words
The method of claim 4 including a step of directing a reconstruction beam from a laser through the associated Fresnel diffraction pattern of the selected encoding pattern, through a Fourier transform lens, through said hologram, and through another Fourier transform lens to form a reconstruction of the selected object pattern on a viewing medium.
Claim 10
Dependent Claim
53 words
The method of claim 3 including a step of directing a reconstruction beam from a laser through the associated Fresnel diffraction pattern of the selected encoding pattern, through a Fourier transform lens, through said hologram, and through an imaging lens to form a reconstruction of the selected object pattern on a viewing medium.
References Cited (Backward Citations)
US3544197A
Cited
US3501221A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |