Patent US5117207A successfully refreshed from Google Patents.
Patent US3575667A successfully refreshed from Google Patents.
US3575667A
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US
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Single mode ring laser
Assignee: AT&T Inc
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Filing: 1967-07-27
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Granted: 1971-04-20
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Expires: 1987-07-27
Abstract
Abstract A highly mode-selective ring laser is made with primary and auxiliary ring resonators that are coupled through beam splitters that direct out of the laser a large portion of radiation in modes that are not resonant in both of the resonators. Typically, the beam splitters will operate on modes propagating in opposite senses. A typical configuration includes primary and auxiliary ring resonators both in the form of quadrilaterals and includes beam splitters with reflectivities chosen to provide a loss for the nonselected modes that is higher than the gain of the laser.
Inventors
- 👤 Peter W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:46
CPC Classifications
H; H01; H01S; H01S3/00; H01S3/05; H01S3/08; H01S3/081; H01S3/083
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
A ring laser comprising a primary ring resonator, an active medium disposed in said primary ring resonator for the emission of coherent radiation, and an auxiliary ring resonator including two independent beam splitters coupling said auxiliary ring resonator to said primary ring resonator, said beam splitters being oriented to direct out of said laser modes that are not resonant in both of said resonators.
Claim 2
Dependent Claim
64 words
A ring laser comprising a primary ring resonator, an active medium disposed in said primary ring resonator for the emission of coherent radiation, and an auxiliary ring resonator including two independent beam splitters coupling said auxiliary ring resonator to said primary ring resonator, said beam splitters being oriented to direct out of said laser modes that are not resonant in both of said resonators.
Claim 3
Dependent Claim
92 words
A ring laser according to claim 1 in which the primary ring resonator comprises a plurality of reflectors forming a light propagation path essentially in the shape of a first closed polygon and the auxiliary ring resonator comprises a second plurality of reflectors including the beam splitters and at least one of said first plurality of reflectors, the second plurality of reflectors forming a light propagation path essentially in the form of a second closed polygon having a plurality of sides that coincide witH portions of sides of said first closed polygon.
Claim 4
Dependent Claim
102 words
A ring laser comprising a primary ring resonator including a plurality of reflectors forming a closed light transmission path, an active medium disposed in said primary ring resonator for the emission of coherent radiation, and an auxiliary ring resonator including in common with said primary ring resonator a plurality of said reflectors, said auxiliary ring resonator further including two partially transmissive reflectors disposed in said light transmission path, said partially transmissive reflectors being oriented to form a closed optical path within said auxiliary resonator and to direct out of the laser those modes that are not resonant in both of said resonators.
Claim 5
Dependent Claim
102 words
A ring laser comprising a primary ring resonator including a plurality of reflectors forming a closed light transmission path, an active medium disposed in said primary ring resonator for the emission of coherent radiation, and an auxiliary ring resonator including in common with said primary ring resonator a plurality of said reflectors, said auxiliary ring resonator further including two partially transmissive reflectors disposed in said light transmission path, said partially transmissive reflectors being oriented to form a closed optical path within said auxiliary resonator and to direct out of the laser those modes that are not resonant in both of said resonators.
Claim 6
Dependent Claim
34 words
A ring laser according to claim 3 in which the partially transmissive reflectors are oriented to direct out of the laser oppositely propagating modes respectively that are not resonant in both of the resonators.
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |