US3741627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Strain biased ferroelectric electro-optics
Assignee: United States Atomic Energy Commission
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Filing: 1971-12-01
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Granted: 1973-06-26
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Expires: 1991-12-01
Abstract
Abstract An electrooptic birefringent device and apparatus using the same including a ferroelectric ceramic plate, which is capable of exhibiting electrically induced birefringence effects, rigidly mounted on a ferroelectric structure, means for electrically inducing a dimensional change in said piezoelectric structure to produce a uniaxial stress in said ceramic plate in a direction parallel to the major surfaces of said plate, and means for thereafter applying electric fields between the major surfaces of the ceramic plate to effect birefringence changes therein.
Inventors
- 👤 G Haertling
- 👤 C Land
- 👤 Kinney I Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:14
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/055
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
197 words
A device for use in an electrooptic apparatus comprising a ferroelectric ceramic element including a ferroelectric ceramic electrooptic plate having generally oppositely disposed optical quality surfaces, said ferroelectric ceramic electrooptic plate being a solid solution exhibiting electrically induced birefringence effects, an optically transparent electrode disposed on one of said optical quality plate surfaces, and electrode means disposed on the other of said optical quality plate surfaces for producing with said transparent electrode longitudinal electric fields through said ferroelectric ceramic plate; a ferroelectric ceramic substrate having high piezoelectric constant and high poling strain which effects changes in dimension under electric poling and switching fields; means for fixedly securing said ferroelectric ceramic substrate to said ferroelectric ceramic element along portions of said element for effecting uniaxial strains in said ferroelectric ceramic electrooptic plate as said substrate changes dimensions; and means for applying poling and switching fields to said ferroelectric ceramic substrate for dimensionally changing thereof in a selected direction and for effecting a uniaxial change in dimension of said ferroelectric ceramic electrooptic plate in planes parallel to said optical quality surfaces in response to said dimension change of said substrate to produce birefringence in said ferroelectric ceramic electrooptic plate.
Claim 2
Independent Claim
197 words
A device for use in an electrooptic apparatus comprising a ferroelectric ceramic element including a ferroelectric ceramic electrooptic plate having generally oppositely disposed optical quality surfaces, said ferroelectric ceramic electrooptic plate being a solid solution exhibiting electrically induced birefringence effects, an optically transparent electrode disposed on one of said optical quality plate surfaces, and electrode means disposed on the other of said optical quality plate surfaces for producing with said transparent electrode longitudinal electric fields through said ferroelectric ceramic plate; a ferroelectric ceramic substrate having high piezoelectric constant and high poling strain which effects changes in dimension under electric poling and switching fields; means for fixedly securing said ferroelectric ceramic substrate to said ferroelectric ceramic element along portions of said element for effecting uniaxial strains in said ferroelectric ceramic electrooptic plate as said substrate changes dimensions; and means for applying poling and switching fields to said ferroelectric ceramic substrate for dimensionally changing thereof in a selected direction and for effecting a uniaxial change in dimension of said ferroelectric ceramic electrooptic plate in planes parallel to said optical quality surfaces in response to said dimension change of said substrate to produce birefringence in said ferroelectric ceramic electrooptic plate.
Claim 3
Dependent Claim
18 words
The device of claim 1 wherein said ferroelectric ceramic plate and said ferroelectric ceramic substrate are substantially coextensive.
Claim 4
Dependent Claim
28 words
The device of claim 1 wherein said electrode means is a second optically transparent electrode disposed on said other optical quality surface of said ferroelectric ceramic electrooptic plate.
Claim 5
Dependent Claim
61 words
The device of claim 1 including means for applying an electric field to said electrode means and said transparent electrode of said ferroelectric ceramic element when said ferroelectric ceramic electrooptic plate dimensions are changed; means for applying polarized light to one of said surfaces of said ferroelectric ceramic plate; and means for sensing changes in birefringence to said ferroelectric ceramic plate.
Claim 6
Dependent Claim
14 words
The device of claim 1 wherein said ferroelectric ceramic substrate is substantially optically transparent.
Claim 7
Dependent Claim
33 words
The device of claim 1 wherein said ferroelectric ceramic element is fixedly secured by said securing means throughout a substantial portion of one of said optical quality surfaces to said ferroelectric ceramic substrate.
Claim 8
Dependent Claim
27 words
The device of claim 1 wherein said ferroelectric ceramic element is fixedly secured along two parallel edges thereof to said ferroelectric ceramic substrate by said securing means.
Claim 9
Dependent Claim
23 words
The device of claim 1 wherein said ferroelectric ceramic substrate includes a passageway therethrough in alignment and communication with said ferroelectric ceramic plate.
References Cited (Backward Citations)
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US3560955A
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US3666666A
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US3659270A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |