Patent US3619796A successfully refreshed from Google Patents.
US3619796A
Expired / Lapsed
US
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Phase-matching arrangements in parametric traveling-wave devices
Assignee: AT&T Inc
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Filing: 1970-04-27
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Granted: 1971-11-09
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Expires: 1990-04-27
Abstract
Abstract The phase deficiency in a parametric traveling-wave device, due to dispersion in the wavepath, is compensated by means of a grating distributed along a surface of an otherwise uniform nonlinear material. In one embodiment of the invention the grating is fixed. In a second, tunable embodiment of the invention, an acoustic surface wave serves as a moving grating.
Inventors
- 👤 Harold Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
H; H03; H03F; H03F13/00; G; G02; G02F; G02F1/00; G02F1/01; G02F1/11; G02F1/125; G02F1/35; G02F1/37; G02F1/377; G02F1/39; G02F1/395
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
A traveling electromagnetic wave parametric device comprising: a dispersive waveguide supportive of electromagnetic wave energy having angular frequencies omega 1, omega 2 and omega 3, where omega 1+ omega 2 omega 3; a uniform, nonlinear material extending longitudinally along a portion of said guide in the direction of wave propagation; said material having distributed along a surface thereof a plurality of discontinuities longitudinally spaced apart a distance d 2 pi m/ Delta Beta , where m is an iNteger, Delta Beta is the phase differential required to satisfy the phase relationship Beta 1+ Beta 2 Beta 3+ Delta Beta , and Beta 1, Beta 2, and Beta 3 are, to a first-order approximation, the phase constants, respectively, of said wave energy.
Claim 2
Dependent Claim
121 words
A traveling electromagnetic wave parametric device comprising: a dispersive waveguide supportive of electromagnetic wave energy having angular frequencies omega 1, omega 2 and omega 3, where omega 1+ omega 2 omega 3; a uniform, nonlinear material extending longitudinally along a portion of said guide in the direction of wave propagation; said material having distributed along a surface thereof a plurality of discontinuities longitudinally spaced apart a distance d 2 pi m/ Delta Beta , where m is an iNteger, Delta Beta is the phase differential required to satisfy the phase relationship Beta 1+ Beta 2 Beta 3+ Delta Beta , and Beta 1, Beta 2, and Beta 3 are, to a first-order approximation, the phase constants, respectively, of said wave energy.
Claim 3
Dependent Claim
16 words
The device according to claim 1 wherein omega 1 omega 2 and Beta 1 Beta 2.
Claim 4
Dependent Claim
13 words
The device according to claim 1 wherein said discontinuities form a fixed grating.
Claim 5
Dependent Claim
13 words
The device according to claim 1 wherein said discontinuities form a moving grating.
Claim 6
Dependent Claim
47 words
The device according to claim 1 including a first electroacoustic transducer for launching an acoustic surface wave along said material, and a second longitudinally spaced transducer for receiving said acoustic wave; and wherein the distance d is equal to the wavelength lambda a of said acoustic wave.
Claim 7
Dependent Claim
53 words
A frequency doubler comprising: a parametric device according to claim 2; a source of wave energy having an angular frequency omega 1 coupled to one end of said device; and output apparatus for receiving wave energy having an angular frequency omega 3 2 omega 1 coupled to the other end of said device.
Claim 8
Dependent Claim
57 words
An amplifier comprising: a parametric device according to claim 1; a signal source having an angular frequency omega 1, and a pump source having an angular frequency 107 3 coupled to one end of said device; and output apparatus for receiving amplified wave energy at angular frequency omega 1 coupled to the other end of said device.
Claim 9
Dependent Claim
105 words
A traveling electromagnetic wave parametric device comprising: a dispersive waveguide including a uniform, nonlinear material extending longitudinally therealong in the direction of wave propagation; said guide being supportive of electromagnetic wave energy having angular frequencies omega 1, omega 2... omega n with phase constants Beta 1, Beta 2... Beta n, respectively, where p omega 1+m omega 2...+n omega n 0 and p Beta 1+m+2...+n Beta n q Delta Beta , where p, m, n and q are integers; characterized in that said material has distributed along a surface thereof a plurality of discontinuities longitudinally spaced apart a distance d 2 pi / Delta Beta .
Claim 10
Dependent Claim
105 words
A traveling electromagnetic wave parametric device comprising: a dispersive waveguide including a uniform, nonlinear material extending longitudinally therealong in the direction of wave propagation; said guide being supportive of electromagnetic wave energy having angular frequencies omega 1, omega 2... omega n with phase constants Beta 1, Beta 2... Beta n, respectively, where p omega 1+m omega 2...+n omega n 0 and p Beta 1+m+2...+n Beta n q Delta Beta , where p, m, n and q are integers; characterized in that said material has distributed along a surface thereof a plurality of discontinuities longitudinally spaced apart a distance d 2 pi / Delta Beta .
References Cited (Backward Citations)
No citation records indexed.
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 |