US3915549A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystals for recording phase holograms
Assignee: RCA Corp
•
Filing: 1974-04-24
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Granted: 1975-10-28
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Expires: 1994-04-24
Abstract
Abstract Single crystal electro-optic material useful for recording phase holograms consists of lithium niobate doped with iron or manganese or lithium tantalate doped with iron. These crystals may also contain other dopants together with the iron or manganese.
Inventors
- 👤 Juan Jose Amodei
- 👤 William Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:00
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G02F1/0541; G03; G03H; G03H1/00; G03H1/02; G03H2260/00; G03H2260/50; G03H2260/54
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
62 words
IN A SYSTEM FOR RECORDING PHASE HOLOGRAMS COMPRISING A LASER, MEANS FOR FORMING AN OBJECT BEAM AND A REFERENCE BEAM AND MEANS FOR RECORDING THE INTERFERENCE DIFFRACTION PATTERN FORMED BY COMBINING SAID OBJECT BEAM AND SAID REFERENCE BEAM WHEREIN SAID RECORDING MEANS COMPRISES CRYSTALLINE LITHIUM NIOBATE DOPED WITH FROM ABOUT 0.0001 TO ABOUT 0.25 MOL PERCENT OF THE LITHIUM NIOBATE OF IRON.
Claim 2
Dependent Claim
62 words
IN A SYSTEM FOR RECORDING PHASE HOLOGRAMS COMPRISING A LASER, MEANS FOR FORMING AN OBJECT BEAM AND A REFERENCE BEAM AND MEANS FOR RECORDING THE INTERFERENCE DIFFRACTION PATTERN FORMED BY COMBINING SAID OBJECT BEAM AND SAID REFERENCE BEAM WHEREIN SAID RECORDING MEANS COMPRISES CRYSTALLINE LITHIUM NIOBATE DOPED WITH FROM ABOUT 0.0001 TO ABOUT 0.25 MOL PERCENT OF THE LITHIUM NIOBATE OF IRON.
Claim 3
Dependent Claim
23 words
The system recited in claim 1 wherein said iron is present in said crystal in a concentration of from 10 to 1000 ppm.
References Cited (Backward Citations)
US3544189A
Cited
US3703328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |