US3754195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double-folded astigmatically compensated optical cavities
Assignee: AT&T Inc
•
Filing: 1972-03-16
•
Granted: 1973-08-21
•
Expires: 1992-03-16
Abstract
Abstract There is disclosed an improvement of a folded astigmatically compensated optical resonator of the type heretofore used for dye lasers to provide more efficient operation by providing a beam waist at a unique axial position in the highly focusing section of the resonator. To obtain the unique beam waist, another section is added to the folded resonator so that the highly focusing section is the middle section. In addition, resonator loss due to coma can be reduced by orienting the two end sections so that they intersect each other.
Inventors
- 👤 W Johnston
- 👤 P Runge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:11
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/0811; H01S3/0812
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
150 words
An optical resonator comprising means for introducing an optical beam therein, first, second and third sections forming path segments to be traversed by said beam, including reflective elements at the relatively remote ends of the path segments of said first and second sections and including circularly symmetrical focusing means for optically connecting said first and second sections to opposite ends of said third section, for folding the optical paths in said first and second sections with respect to the optical path in said third section, and for convergently focusing the beam to a waist in said third section, and a Brewster-angle cell disposed in said third section and encompassing said waist, said first and second sections having mutual angles of folding and degrees of focusing to yield the only beam waist for all cross-sectional directions in said third section at a unique location on the path segment in said cell.
Claim 2
Dependent Claim
150 words
An optical resonator comprising means for introducing an optical beam therein, first, second and third sections forming path segments to be traversed by said beam, including reflective elements at the relatively remote ends of the path segments of said first and second sections and including circularly symmetrical focusing means for optically connecting said first and second sections to opposite ends of said third section, for folding the optical paths in said first and second sections with respect to the optical path in said third section, and for convergently focusing the beam to a waist in said third section, and a Brewster-angle cell disposed in said third section and encompassing said waist, said first and second sections having mutual angles of folding and degrees of focusing to yield the only beam waist for all cross-sectional directions in said third section at a unique location on the path segment in said cell.
Claim 3
Dependent Claim
33 words
An optical resonator according to claim 1 in which the first and second sections include end reflectors opposite the third section curved to provide equal confocal parameters for said first and second sections.
Claim 4
Dependent Claim
23 words
An optical resonator according to claim 1 in which said first and second sections are optically symmetrical with respect to said third section.
Claim 5
Dependent Claim
41 words
An optical resonator according to claim 1 in which one of the first and second sections includes means for tuning the resonant frequencies of said resonator and the other of said first and second sections has a partially transmissive end reflector.
Claim 6
Dependent Claim
51 words
An optical resonator according to claim 1 in which distinct porTions of said resonator have characteristic coma and in which the first and section sections intersect at intermediate points separated from any focusing elements or reflecting elements on the path segments in said first and second sections to counteract said coma.
References Cited (Backward Citations)
US3479620A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |