Patent US2130948A successfully refreshed from Google Patents.
US4247831A
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US
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Ring lasers
Assignee: UK Secretary of State for Defence
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Filing: 1978-11-29
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Granted: 1981-01-27
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Expires: 1998-11-29
Abstract
Abstract The invention provides a ring laser having one or more parallel-sided prisms, or other refracting device, positioned in the light path of the laser resonant cavity formed by, for example, three mirrors, and including a solenoid or other means for imparting oscillatory translational motion to the prism or prisms or refracting device with a component parallel to the portion of the light path which passes therethrough.
Inventors
- 👤 Anthony J. Lindop
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:27
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A ring laser having a resonant cavity, said laser including at least one parallel-sided isotropic light refracting device arranged with the parallel sides thereof at an oblique angle to a part of the light path which intersects said sides, and means for applying an oscillatory translational motion to said refracting device wherein the motion has a component parallel to said part of the light path.
Claim 2
Dependent Claim
65 words
A ring laser having a resonant cavity, said laser including at least one parallel-sided isotropic light refracting device arranged with the parallel sides thereof at an oblique angle to a part of the light path which intersects said sides, and means for applying an oscillatory translational motion to said refracting device wherein the motion has a component parallel to said part of the light path.
Claim 3
Dependent Claim
50 words
A ring laser as in claim 1 wherein said light refracting device comprises two parallel-sided prisms arranged such that a lateral shift in the light path due to refraction by one of said prisms is complemented by an equal and opposite lateral shift due to refraction by the other prism.
Claim 4
Dependent Claim
40 words
A ring laser as in claim 1 wherein said light refracting device comprises a plurality of parallel-sided prisms, wherein said prisms are arranged so that the light path intersects the prisms at Brewster's angle thereby reducing reflection from the prisms.
Claim 5
Dependent Claim
22 words
A ring laser as in claims 2 or 3 wherein the parallel sides of said prisms are coated with dielectric anti-reflecting coatings.
References Cited (Backward Citations)
US3791738A
Cited
US4152071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-01-27 | 1984-07-28 | 1985-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-27 | 1988-07-28 | 1989-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-27 | 1992-07-28 | 1993-01-27 | $7700.00 | Window Closed / Lapsed |