Patent US3767285A successfully refreshed from Google Patents.
US3767285A
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Enhanced readout of stored holograms
Assignee: RCA Corp
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Filing: 1972-07-28
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Granted: 1973-10-23
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Expires: 1992-07-28
Abstract
Abstract Virtual image readout of relatively high intensity is obtained by employing two readout beams, one following the path of the reference beam and the other following the path of the object beam, and modulating at least one of the beams. Amplitude, intensity or phase modulation may be employed.
Inventors
- 👤 R Mezrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:16
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/26; G11; G11C; G11C13/00; G11C13/04; G11C13/042; Y; Y10; Y10S; Y10S359/00; Y10S359/90
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A method of reading out a hologram formed by the interference of a reference beam and an object beam, comprising the steps of: directing two spatially unmodulated beams onto the hologram, one following the path of the reference beam and the other following the path of the object beam; temporally modulating one of the beams at a given frequency; and detecting at least the given frequency component of the virtual image reconstructed by the two beams.
Claim 2
Independent Claim
76 words
A method of reading out a hologram formed by the interference of a reference beam and an object beam, comprising the steps of: directing two spatially unmodulated beams onto the hologram, one following the path of the reference beam and the other following the path of the object beam; temporally modulating one of the beams at a given frequency; and detecting at least the given frequency component of the virtual image reconstructed by the two beams.
Claim 3
Dependent Claim
22 words
The method as set forth in claim 1 wherein the step of modulating one of the beams comprises amplitude modulating said beam.
Claim 4
Dependent Claim
22 words
The method as set forth in claim 1 wherein the step of modulating one of the beams comprises phase modulating said beam.
Claim 5
Dependent Claim
22 words
The method as set forth in claim 1 wherein the step of modulating one of the beams comprises intensity modulating said beam.
Claim 6
Dependent Claim
65 words
An arrangement for reading out a hologram comprising, in combination: means for directng two beams at the hologram, one following the path of the reference beam and the other following the path of the object beam; means for modulating one of said beams at a given frequency; and means for detecting at least the given frequency component of the image reconstructed by the two beams.
Claim 7
Dependent Claim
65 words
An arrangement for reading out a hologram comprising, in combination: means for directng two beams at the hologram, one following the path of the reference beam and the other following the path of the object beam; means for modulating one of said beams at a given frequency; and means for detecting at least the given frequency component of the image reconstructed by the two beams.
Claim 8
Dependent Claim
30 words
An arrangement as set forth in claim 5, further including: means for modulating the other of said beams at a frequency different than that employed to modulate said one beam.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |