US4155055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wave device having a reverse domain grating
Assignee: RCA Corp
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Filing: 1977-12-23
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Granted: 1979-05-15
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Expires: 1997-12-23
Abstract
Abstract This invention relates to a wave device comprising a single domain lithium niobate substrate having thereon a grating wherein the grating comprises single domain regions of lithium niobate having their plus c-axis direction substantially opposite the plus c-axis direction of the substrate.
Inventors
- 👤 William Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:10
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/02543; H03H9/02559; H03H9/125; H03H9/145
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
42 words
A wave device comprised of a single domain lithium niobate substrate having a grating in a surface thereof wherein the grating comprises single domain regions of lithium niobate having their plus c-axis direction substantially opposite the plug c-axis direction of the substrate.
Claim 2
Dependent Claim
42 words
A wave device comprised of a single domain lithium niobate substrate having a grating in a surface thereof wherein the grating comprises single domain regions of lithium niobate having their plus c-axis direction substantially opposite the plug c-axis direction of the substrate.
Claim 3
Dependent Claim
26 words
A wave device according to claim 1 wherein the wave device is an optical wave device having grating elements spaced about 0.5 to 10 micrometers apart.
Claim 4
Dependent Claim
27 words
A wave device according to claim 1 wherein the wave device is a surface acoustic wave device having grating elements spaced about 1 to 100 micrometers apart.
Claim 5
Independent Claim
147 words
A method for forming a grating on a single domain lithium niobate substrate which comprises: (a) depositing a metal layer in the form of a grating pattern on the substrate wherein the metal is one that will lower the Curie temperature of the substrate when diffused therein; (b) diffusing the metal layer into the substrate; (c) heating the substrate to a temperature below the Curie temperature of the substrate but above the Curie temperature of the diffused metal layer; (d) applying an electrical potential to the heated substrate with the positive pole of the potential contacting the plus c-axis face of the substrate and the negative pole of the potential contacting the negative c-axis face of the substrate; and (e) cooling the heated substrate below the Curie temperature of the diffused regions with the electrical potential applied thereby reversing the plus c-axis direction of the diffused regions.
Claim 6
Independent Claim
147 words
A method for forming a grating on a single domain lithium niobate substrate which comprises: (a) depositing a metal layer in the form of a grating pattern on the substrate wherein the metal is one that will lower the Curie temperature of the substrate when diffused therein; (b) diffusing the metal layer into the substrate; (c) heating the substrate to a temperature below the Curie temperature of the substrate but above the Curie temperature of the diffused metal layer; (d) applying an electrical potential to the heated substrate with the positive pole of the potential contacting the plus c-axis face of the substrate and the negative pole of the potential contacting the negative c-axis face of the substrate; and (e) cooling the heated substrate below the Curie temperature of the diffused regions with the electrical potential applied thereby reversing the plus c-axis direction of the diffused regions.
Claim 7
Dependent Claim
18 words
A method according to claim 4 wherein the deposited metal layer is about 300 to 2000 angstroms thick.
Claim 8
Dependent Claim
21 words
A method according to claim 4 wherein the substrate is heated to a temperature of about 1075° C. to 1105° C.
Claim 9
Dependent Claim
32 words
A method according to claim 4 wherein the potential is about 0.2 to 1.0 volt per centimeter between said faces of the substrate, and the D. C. current is about 200 microamperes.
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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |