US4096447A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unstable resonator laser system
Assignee: United States Department of the Navy
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Filing: 1976-11-24
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Granted: 1978-06-20
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Expires: 1996-11-24
Abstract
Abstract Optical radiation reflective surfaces for use in an unstable resonator laser system in which the output beam of the system does not contain an aperture in the middle of the beam thereby avoiding the requirement of a collimation lens system to obtain a beam of minimum divergence. The system provides an output beam which does not have a central hole.
Inventors
- 👤 Frederick R. Fluhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:02
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/08081
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
An unstable resonator laser system which comprises: an active laser medium; an annular, aspheric, primary concave mirror opposite one end of said active laser medium and positioned with its focal ring centered on the axis of said active laser medium, said mirror being formed with a circular aperture through the center thereof; an annular, flat feedback mirror positioned on the opposite side of said active laser medium in axial alignment with said primary concave mirror and perpendicular to the axis; and an, aspheric secondary mirror encircled by said flat mirror so that it is concentric therewith and acting to reflect light to said primary concave mirror, said secondary mirror having its focal ring centered on the axis of said active laser medium, whereby said flat feedback mirror provides the resonant feedback for said system and said secondary mirror reflects the output through the aperture in the annular, aspheric, primary concave mirror.
Claim 2
Dependent Claim
151 words
An unstable resonator laser system which comprises: an active laser medium; an annular, aspheric, primary concave mirror opposite one end of said active laser medium and positioned with its focal ring centered on the axis of said active laser medium, said mirror being formed with a circular aperture through the center thereof; an annular, flat feedback mirror positioned on the opposite side of said active laser medium in axial alignment with said primary concave mirror and perpendicular to the axis; and an, aspheric secondary mirror encircled by said flat mirror so that it is concentric therewith and acting to reflect light to said primary concave mirror, said secondary mirror having its focal ring centered on the axis of said active laser medium, whereby said flat feedback mirror provides the resonant feedback for said system and said secondary mirror reflects the output through the aperture in the annular, aspheric, primary concave mirror.
Claim 3
Dependent Claim
19 words
An unstable resonator laser system as claimed in claim 1, wherein: said secondary mirror is of a convex type.
Claim 4
Dependent Claim
19 words
An unstable resonator laser system as claimed in claim 1, wherein: said secondary mirror is of a concave type.
References Cited (Backward Citations)
US3942127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |