Patent US4011523A successfully refreshed from Google Patents.
US4011523A
Expired / Lapsed
US
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Azimuthal mode control for laser
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1975-10-21
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Granted: 1977-03-08
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Expires: 1995-10-21
Abstract
Abstract Azimuthal mode control for lasers employs an optical system which rotates the image to produce an optical feedback system, which through interference with the cavity fields, supresses the unwanted modes.
Inventors
- 👤 Dennis N. Mansell
- 👤 Donald L. Bullock
- 👤 Stuart G. Forbes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:56
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08018; H01S3/081; H01S3/083; H01S3/082
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
84 words
A laser system of the type having a large Fresnel number and an azimuthal mode control for its output beam, said system comprising: a. a laserable medium; b. means for pumping said laserable medium; c. an optical resonant cavity enclosing said medium for generating an output beam; d. means for geometrically rotating and optically mixing the output beam within said cavity; e. means for feeding the output beam back through the laser system; and f. output means for removing the beam from the system.
Claim 2
Dependent Claim
84 words
A laser system of the type having a large Fresnel number and an azimuthal mode control for its output beam, said system comprising: a. a laserable medium; b. means for pumping said laserable medium; c. an optical resonant cavity enclosing said medium for generating an output beam; d. means for geometrically rotating and optically mixing the output beam within said cavity; e. means for feeding the output beam back through the laser system; and f. output means for removing the beam from the system.
Claim 3
Dependent Claim
24 words
A laser system as defined in claim 1 wherein said means for geometrically rotating includes means for producing beam rotation by an out-of-plane reflection.
Claim 4
Dependent Claim
22 words
A laser system as defined in claim 1 wherein means is provided for feeding the beam back through said optical laser cavity.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |