Patent US3679907A successfully refreshed from Google Patents.
US3679907A
Expired / Lapsed
US
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Lithium formate nonlinear devices
Assignee: AT&T Inc
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Filing: 1970-08-03
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Granted: 1972-07-25
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Expires: 1990-08-03
Abstract
Abstract The hydrated and deuterated forms of lithium formate are found to be useful nonlinear materials for use over a wavelength range including the visible spectrum. While conversion efficiency is inferior to that of lithium niobate or barium sodium niobate, resistance to radiation damage is significantly greater. Operation at power levels in excess of 106 watts/cm2 has resulted in no perceptible damage. These materials are suitably incorporated in second harmonic generators as well as in other parametric devices.
Inventors
- 👤 William Adam Bonner
- 👤 Shobha Singh
- 👤 Le Grand Gerard Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:03
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/3551
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
17 words
Device of claim 1 in which at least one of said means comprises an optically polished surface.
Claim 2
Dependent Claim
85 words
Device of claim 1 in which the birefringence of the said body is at least as great as the dispersion in velocity of the two said frequencies within the said body and in which the said body is positioned so that the direction defined by the said incoming beam and the optic axis is such that an ordinary wave of one of the said frequencies within the said body is phase matched to an extraordinary wave of another of the said frequencies within the body.
Claim 3
Dependent Claim
25 words
Device of claim 3 together with resonant means for supporting a standing wave of at least one of the said frequencies in the said body.
Claim 4
Dependent Claim
36 words
Device of claim 4 in which there are coherent electromagnetic waves of three frequencies within the said body and the frequency relationship is such that the greatest is equal to the sum of the other two.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |