US3619795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase matching in dielectric waveguides to extend the interaction distance of harmonic generators and parametric amplifiers
Assignee: AT&T Inc
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Filing: 1970-04-10
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Granted: 1971-11-09
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Expires: 1990-04-10
Abstract
Abstract The interaction distance in harmonic generators and parametric amplifiers is extended over a sufficiently long distance to effect optimum frequency conversion by forming the nonlinear dielectric medium into a waveguide, and proportioning its crosssectional dimensions such that the relevant waves propagate with the same phase velocity. In an harmonic generator, the waveguide is proportioned such that the applied fundamental frequency wave and the orthogonally polarized, harmonic wave induced in the medium propagate with the same phase velocity. In a parametric amplifier, the applied signal and the induced idler wave propagate with the same polarization, while the pump wave is orthogonally polarized.
Inventors
- 👤 Enrique Alfredo Jose Marcatili
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:45
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/39; G02F1/395; G02F1/37
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
A nonlinear system supportive of orthogonally polarized electromagnetic wave signals having different, related frequencies, comprising: a rectangular wavepath including a piezoelectric material; characterized in that the cross-sectional dimensions of said wavepath are proportioned such that the phase velocities of said orthogonally polarized waves are equal.
Claim 2
Dependent Claim
45 words
A nonlinear system supportive of orthogonally polarized electromagnetic wave signals having different, related frequencies, comprising: a rectangular wavepath including a piezoelectric material; characterized in that the cross-sectional dimensions of said wavepath are proportioned such that the phase velocities of said orthogonally polarized waves are equal.
Claim 3
Dependent Claim
26 words
The system according to claim 1 wherein saiD wavepath comprises: an elongated strip of said piezoelectric material embedded in a dielectric substrate of lower refractive index.
Claim 4
Dependent Claim
38 words
The system according to claim 1 wherein an input signal, polarized along a first direction, induces an orthogonally polarized harmonic signal in said piezoelectric material; and wherein said signals propagate along said wavepath with the same phase velocity.
Claim 5
Dependent Claim
51 words
The system according to claim 1 wherein an input signal, polarized along a first direction, and an orthogonally polarized applied pump signal, induce a difference frequency idler signal in said piezoelectric material polarized along said first direction; and wherein said signals propagate along said wavepath with substantially the same phase velocity.
References Cited (Backward Citations)
US3537020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |