US3984675A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband tunable coherent source
Assignee: Lockheed Martin Corp
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Filing: 1971-02-12
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Granted: 1976-10-05
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Expires: 1991-02-12
Abstract
Abstract A tunable wideband coherent source comprising a laser source and a microwave source, means for combining and mixing the outputs of the laser and microwave sources so as to provide a combined output, and means for filtering the combined output so as to separate sum and difference components, with any undesired background being suppressed. Our source may be used with means for utilizing the sum signal, the difference signal, or both of these.
Inventors
- 👤 Vincent J. Corcoran
- 👤 Richard E. Cupp
- 👤 James J. Gallagher
- 👤 William T. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/353; G02F1/3534
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
A variable frequency coherent source comprising a first source and a second source, said first source being a laser source, and said second source being an electromagnetic wave source tunable over selected ranges of the microwave portion of the electromagnetic spectrum, means for combining and for mixing the outputs of said first and second sources over substantially the entire tuning range of said second source, so as to provide a combined output, such combined output comprising the laser source frequency, the electromagnetic wave source frequency, and sum and differences of such two frequencies, and means for filtering the combined output before transmission thereof, so that at least one of such sum and difference frequencies will be passed as a desired signal, with any undesired background thus being eliminated, such desired signal then being delivered to a point of use, said means for combining and mixing being a nonlinear crystal.
Claim 2
Dependent Claim
149 words
A variable frequency coherent source comprising a first source and a second source, said first source being a laser source, and said second source being an electromagnetic wave source tunable over selected ranges of the microwave portion of the electromagnetic spectrum, means for combining and for mixing the outputs of said first and second sources over substantially the entire tuning range of said second source, so as to provide a combined output, such combined output comprising the laser source frequency, the electromagnetic wave source frequency, and sum and differences of such two frequencies, and means for filtering the combined output before transmission thereof, so that at least one of such sum and difference frequencies will be passed as a desired signal, with any undesired background thus being eliminated, such desired signal then being delivered to a point of use, said means for combining and mixing being a nonlinear crystal.
Claim 3
Dependent Claim
23 words
The source of claim 1 wherein said nonlinear crystal is disposed in a waveguide usable for phase matching said laser and microwave sources.
References Cited (Backward Citations)
US3433958A
Cited
US3624551A
Cited
US3610932A
Cited
US3639774A
Cited
US3639775A
Cited
US3679288A
Cited
US3665204A
Cited
US3675039A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |