US3703328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Devices utilizing improved linbo' holographic medium
Assignee: AT&T Inc
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Filing: 1971-07-21
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Granted: 1972-11-21
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Expires: 1991-07-21
Abstract
Abstract Volume holographic devices utilize lithium niobate, LiNbO3, containing added iron ions. The added ions provide for improved resolution and contrast. Utilization is made of the improved material in devices designed for multiple image recording and readout. In a preferred embodiment, selection, as among images, is determined by the angle of incidence of the interrogating beam.
Inventors
- 👤 Alastair Malcolm Glass
- 👤 George Earl Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:52
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/72; G03C1/725; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G02F1/0541; G03H; G03H1/00; G03H1/02; G03H1/024; G03H1/0248; G03H1/26; G03H1/2645; G03H1/265; H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; G03H1/28; G03H2240/00; G03H2240/20; G03H2240/23; G03H2240/24; G03H2260/00; G03H2260/50; G03H2260/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
A volume hologram storage arrangement comprising a single crystalline body of material within the range designated by the formula (LiO2)0.44-0.5(Nb2O5)0.56-0.5, said body having a thickness sufficient to permit storage of multiple images therein when irradiated on a given surface by an information-containing beam incident on the said surface at any of a number of angles of incidence corresponding with the number of multiple images together with means for directing at least a first beam of coherent electromagnetic energy at the said crystal, said means including provision for making the said beam incident on the said body at any of a number of prescribed angles of incidence, characterized in that the said material contains iron added in an amount sufficient to produce a total Fe2 ion content of at least 50 ppm based on total cationic content of the said material and at least an equal number of Fe3 ions.
Claim 2
Dependent Claim
149 words
A volume hologram storage arrangement comprising a single crystalline body of material within the range designated by the formula (LiO2)0.44-0.5(Nb2O5)0.56-0.5, said body having a thickness sufficient to permit storage of multiple images therein when irradiated on a given surface by an information-containing beam incident on the said surface at any of a number of angles of incidence corresponding with the number of multiple images together with means for directing at least a first beam of coherent electromagnetic energy at the said crystal, said means including provision for making the said beam incident on the said body at any of a number of prescribed angles of incidence, characterized in that the said material contains iron added in an amount sufficient to produce a total Fe2 ion content of at least 50 ppm based on total cationic content of the said material and at least an equal number of Fe3 ions.
Claim 3
Dependent Claim
14 words
Arrangement of claim 1 in which the Fe2 content is at least 100 ppm.
Claim 4
Dependent Claim
28 words
Storage arrangement of claim 1 in which the means for providing a prescribed angle of incidence consists essentially of an angular deflector element juxtapositioned to the said crystal.
Claim 5
Dependent Claim
21 words
Arrangement of claim 3 in which the said deflector depends for its operation upon an acoustooptic interaction with the said beam.
Claim 6
Dependent Claim
19 words
Arrangement of claim 1 including x and y deflector elements for selectively irradiating discrete areas of the said crystal.
Claim 7
Dependent Claim
17 words
Arrangement of claim 5 in which the said deflectors depend for their operation upon an acoustooptic interaction.
Claim 8
Dependent Claim
17 words
Arrangement of claim 5 in which the said deflectors depend for their operation on an electrooptic interaction.
Claim 9
Dependent Claim
17 words
Arrangement of claim 7 in which the said deflectors depend for their operation on a magnetooptic interaction.
References Cited (Backward Citations)
US3544189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-21 | 1976-05-22 | 1976-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-21 | 1980-05-22 | 1980-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-21 | 1984-05-22 | 1984-11-21 | $7700.00 | Window Closed / Lapsed |