US3655993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically rotatory dielectric-guided parametric oscillators
Assignee: AT&T Inc
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Filing: 1970-07-10
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Granted: 1972-04-11
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Expires: 1990-07-10
Abstract
Abstract There is disclosed a parametric oscillator having reduced optical loss and increased interaction pathlength because it employs an optically rotatory liquid in a capillary tube of lower refractive index and of internal diameter of the order of one micrometer. The pumping beam is launched off-axis into the liquid to generate signal and idler beams such that all three beams at any given point propagate in intersecting directions and yet are guided along the capillary tube. Each beam is reflected at the capillary wall with at least a minimum angle Phi from the normal to the glass, such that sin Phi is greater than the ratio of the index of refraction of the glass to the index of refraction of the liquid.
Inventors
- 👤 Peter Adalbert Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:28
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/39; G02F1/395; H; H03; H03F; H03F7/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
142 words
An apparatus for parametrically generating an electromagnetic wave for utilization, comprising a dielectric capillary tube having a first index n1 of refraction, an optically rotatory liquid contained in said capillary tube, said liquid having a substantial nonlinear coefficient for three interacting singlefrequency electromagnetic waves including the wave to be generated and propagating in mutually intersecting directions in said liquid, said liquid having a second index of refraction n2 related to said first index according to n1/n2 < OR = sin Phi where Phi is the minimum incidence angle of any of said waves with respect to the normal at said tube, and means coupled to said tube for supplying to said liquid oblique to the axis of said tube one of said waves other than said wave to be generated to enable phase-matching of said waves and to provide the nonlinear interaction.
Claim 2
Independent Claim
142 words
An apparatus for parametrically generating an electromagnetic wave for utilization, comprising a dielectric capillary tube having a first index n1 of refraction, an optically rotatory liquid contained in said capillary tube, said liquid having a substantial nonlinear coefficient for three interacting singlefrequency electromagnetic waves including the wave to be generated and propagating in mutually intersecting directions in said liquid, said liquid having a second index of refraction n2 related to said first index according to n1/n2 < OR = sin Phi where Phi is the minimum incidence angle of any of said waves with respect to the normal at said tube, and means coupled to said tube for supplying to said liquid oblique to the axis of said tube one of said waves other than said wave to be generated to enable phase-matching of said waves and to provide the nonlinear interaction.
Claim 3
Dependent Claim
54 words
An apparatus according to claim 1 in which the ratio n1/n2 is less than unity, the means for supplying one of the waves to the liquid comprising means for launching said wave into said liquid at an angle with respect to the normal to the tube greater than about 45* and less than 90*.
Claim 4
Dependent Claim
30 words
An apparatus according to claim 2 including means for resonating a generated wave in said liquid, the launching means comprising a grating disposed in a side wall of the tube.
References Cited (Backward Citations)
US3571607A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |