US3694055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thin film, biaxially birefringent nonlinear devices
Assignee: AT&T Inc
•
Filing: 1971-03-12
•
Granted: 1972-09-26
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Expires: 1991-03-12
Abstract
Abstract Phase matching for different frequency waves of electromagnetic energy is accomplished within a thin film of nonlinear material in which the index of refraction for a wave polarized orthogonal to the plane of the film is lower than that for a wave to which it is coupled which is polarized parallel to the plane of the film, and in which the index of refraction for waves polarized parallel to the plane of the film differs depending upon beam direction. An exemplary material is polyvinylidene fluoride which is mechanically oriented by biaxial stressing and which is electrically poled.
Inventors
- 👤 John George Bergman Jr
- 👤 James Hoffman Mcfee
- 👤 Ping King Tien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:05
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
31 words
Device of claim 1 in which said thin film consists essentially of a polymeric material having a coupling coefficient of at least 10 11 esv between said first and second waves.
Claim 2
Dependent Claim
14 words
Device of claim 2 in which said polymeric material is essentially a substituted hydrocarbon.
Claim 3
Dependent Claim
25 words
Device of claim 3 in which said substituted hydrocarbon contains substituents selected from the group consisting of fluorine, bromine, chlorine, iodine, nitrate, hydroxyl, and acid.
Claim 4
Dependent Claim
41 words
Device of claim 4 in which the said substituted hydrocarbon has a crystallinity of at least 10 percent and in which the crystalline portion belongs to a polar-point group defining a symmetry in which three crystallographic axes are of different lengths.
Claim 5
Dependent Claim
27 words
Device of claim 5 in which the said substituted hydrocarbon is selected from the group consisting essentially of polyvinylidene fluoride, polyacrylonitrile, polyethyleneterephthalate, polyvinylfluoride, polyvinylchloride, and polyvinylidene chloride.
Claim 6
Dependent Claim
15 words
Device of claim 6 in which the said substituted hydrocarbon consists essentially of polyvinylidene fluoride.
Claim 7
Dependent Claim
16 words
Device of claim 1 in which at least one of said means includes a coupling prism.
Claim 8
Dependent Claim
14 words
Device of claim 8 in which each of said means includes a coupling prism.
Claim 9
Dependent Claim
34 words
Device of claim 1 in which said first and second means are so arranged as to provide for a propagation direction for the first and second waves such that they are effectively phase matched.
Claim 10
Dependent Claim
20 words
Device of claim 10 in which the said propagation direction is intermediate that of two crystallographic directions within the film.
Claim 11
Dependent Claim
42 words
Device of claim 9 adapted for second harmonic generation in which the means for introducing wave energy provides for introduction of the said second wave and in which the means for extracting wave energy includes means for extracting the said first wave.
Claim 12
Dependent Claim
42 words
Device of claim 9 adapted for downshifting parametric operation in which the means for introducing wave energy provides for introduction of the said first wave and in which the means for extracting wave energy includes means for extracting the said second wave.
References Cited (Backward Citations)
US3387204A
Cited
US3537020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |