US3867012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Novel lithium niobate single crystal film structure
Assignee: RCA Corp
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Filing: 1974-04-29
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Granted: 1975-02-18
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Expires: 1994-04-29
Abstract
Abstract A film of a single crystal lithium niobate film on a platinum coated lithium tantalate crystal can be prepared by depositing a thin layer of platinum on a polished lithium tantalate crystal surface, depositing a layer of finely divided lithium niobate on the platinum and fusing the lithium niobate. Such films are useful in optical waveguide electro-optic modulators and acoustic surface wave devices.
Inventors
- 👤 William Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:58
CPC Classifications
C; C30; C30B; C30B19/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
34 words
AN ARTICLE CONSISTING ESSENTIALLY OF AN ORIENTED LITHIUM TANTALATE CRYSTAL, A LAYER OF PLATINUM FROM ABOUT 150 TO 2,500 ANGSTROMS THICK THEREON AND AN EPITAXIAL SINGLE CRYSTAL LITHIUM NIOBATE FILM ON THE PLATINUM LAYER.
Claim 2
Dependent Claim
34 words
AN ARTICLE CONSISTING ESSENTIALLY OF AN ORIENTED LITHIUM TANTALATE CRYSTAL, A LAYER OF PLATINUM FROM ABOUT 150 TO 2,500 ANGSTROMS THICK THEREON AND AN EPITAXIAL SINGLE CRYSTAL LITHIUM NIOBATE FILM ON THE PLATINUM LAYER.
Claim 3
Dependent Claim
17 words
An article according to claim 1 wherein the platinum layer is discontinuous over the lithium tantalate crystal.
Claim 4
Independent Claim
41 words
A METHOD OF FORMING AN EPITAXIAL SINGLE CRYSTAL LAYER OF LITHIUM NIOBATE ON A CONDUCTING SURFACE WHICH COMPRISES: A. DEPOSITING A COATING OF PLATINUM FROM 150 TO 2,500 ANGSTROMS THICK ON A POLISHED SURFACE OF A SINGLE CRYSTAL LITHIUM TANTALATE SUBSTRATE,
Claim 5
Independent Claim
41 words
A METHOD OF FORMING AN EPITAXIAL SINGLE CRYSTAL LAYER OF LITHIUM NIOBATE ON A CONDUCTING SURFACE WHICH COMPRISES: A. DEPOSITING A COATING OF PLATINUM FROM 150 TO 2,500 ANGSTROMS THICK ON A POLISHED SURFACE OF A SINGLE CRYSTAL LITHIUM TANTALATE SUBSTRATE,
Claim 6
Dependent Claim
17 words
A method according to claim 3 wherein the platinum layer is from 400 to 1,000 angstroms thick.
Claim 7
Dependent Claim
21 words
A method according to claim 3 wherein the fusion step is carried out at a temperature from about 1,260* to 1,275*C.
Claim 8
Dependent Claim
16 words
A method according to claim 3 wherein the platinum layer is deposited by radio frequency sputtering.
Claim 9
Dependent Claim
20 words
A method according to claim 3 wherein the finely divided lithium niobate particles are below about 30 microns in size.
Claim 10
Dependent Claim
23 words
A method according to claim 7 wherein the finely divided lithium niobate particles are from about 5 to about 10 microns in size.
Claim 11
Dependent Claim
61 words
In a light modulator comprising a source of coherent light, an optical waveguide, a plurality of electrodes disposed on said waveguide, optical input means disposed on one side of one electrode and optical output means disposed on the other side of said electrode, the improvement which comprises employing as the optical waveguide an article prepared by the method of claim 1.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |