Patent US2141169A successfully refreshed from Google Patents.
US4052119A
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Crystals for recording phase holograms
Assignee: RCA Corp
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Filing: 1976-03-29
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Granted: 1977-10-04
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Expires: 1996-03-29
Abstract
Abstract Single crystal electro-optic material useful for recording phase holograms comprises lithium niobate or lithium tantalate doped with iron and silicon.
Inventors
- 👤 Brown F. Williams
- 👤 William Joseph Burke
- 👤 William Phillips
- 👤 David Lloyd Staebler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:42
CPC Classifications
G; G03; G03H; G03H1/00; G03H1/02; G11; G11C; G11C13/00; G11C13/04; G11C13/042; G11C13/044; G03H2001/026; G03H2260/00; G03H2260/50; G03H2260/54
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
52 words
A single crystal useful for recording phase holograms which comprises a crystal selected from the group consistng of lithium niobate and lithium tantalate, said crystal prepared by doping with iron and from 50 to 300 parts per million of silicon wherein said crystal contains from 0.005 to 0.25 mole percent of iron.
Claim 2
Dependent Claim
52 words
A single crystal useful for recording phase holograms which comprises a crystal selected from the group consistng of lithium niobate and lithium tantalate, said crystal prepared by doping with iron and from 50 to 300 parts per million of silicon wherein said crystal contains from 0.005 to 0.25 mole percent of iron.
Claim 3
Dependent Claim
83 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 pattern formed by combining said object beam and said reference beam wherein said recording means comprises a single crystal selected from the group consisting of lithium niobate and lithium tantalate, said crystal doped with iron and from 50 to 300 parts per million of silicon wherein said crystal contains from 0.005 to 0.25 mole percent of iron.
Claim 4
Dependent Claim
83 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 pattern formed by combining said object beam and said reference beam wherein said recording means comprises a single crystal selected from the group consisting of lithium niobate and lithium tantalate, said crystal doped with iron and from 50 to 300 parts per million of silicon wherein said crystal contains from 0.005 to 0.25 mole percent of iron.
Claim 5
Independent Claim
81 words
A method for recording phase holograms which comprises illuminating selected portions of a holographic recording crystal so as to alter the refractive index of said selected portions and detecting the changes in refractive index wherein the holographic recording crystal comprises a single crystal selected from the group consisting of lithium niobate and lithium tantalate, said crystal doped with iron and from 50 to 300 parts per million of silicon wherein said crystal contains from 0.005 to 0.25 mole percent of iron.
Claim 6
Independent Claim
81 words
A method for recording phase holograms which comprises illuminating selected portions of a holographic recording crystal so as to alter the refractive index of said selected portions and detecting the changes in refractive index wherein the holographic recording crystal comprises a single crystal selected from the group consisting of lithium niobate and lithium tantalate, said crystal doped with iron and from 50 to 300 parts per million of silicon wherein said crystal contains from 0.005 to 0.25 mole percent of iron.
Claim 7
Dependent Claim
26 words
A method according to claim 3 wherein said crystal will fix a hologram as fast as the hologram is written at recording temperatures below 160° C.
References Cited (Backward Citations)
US3915549A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |