Patent US3572898A successfully refreshed from Google Patents.
US3572898A
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Z-cut crystal electro-optical modulator
Assignee: International Standard Electric Corp
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Filing: 1968-08-12
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Granted: 1971-03-30
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Expires: 1988-08-12
Abstract
Abstract A plurality of Z-cut KDP-type crystal optical modulators, each having a fast axis and a retard axis associated therewith, are arranged in a stack so as to require a potential lower than that required for modulation utilizing a single crystal. Each crystal is formed with an annular recess around a center island on the upper and lower surface and recessed tails extending, in orthogonal relationship one to the other, from each annular recess. The crystals are stacked with alternate plates similarly aligned and adjacent plates oppositely aligned with respect to their fast and retard axes. A conductor is connected between each annular recess and one of two terminals of a source of potential in such manner that the effect of successive plates is additive.
Inventors
- 👤 Charles Cecil Eaglesfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:21
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0305; G02F1/0322
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
An electro-optical modulator comprising: a plurality of plates of a material which exhibits an electrooptical effect; a first and a second major surface associated with each plate; a fast axis and a retard axis in orthogonal relationship associated with each of said plurality of plates; means for stacking said plurality of plates so that alternate plates are similarly aligned and adjacent plates oppositely aligned with respect to their fast and retard axes, so that the electro-optical effects of the plates are additive; a first conductor connected to said first major surface and a second conductor connected to said second major surface; a first and second terminal; means connecting the first conductor of alternate plates and the second conductor of the plates adjacent to said alternate plates to said first terminal; and means for connecting the second conductor of said alternate plates and the first conductor of adjacent plates to said second terminal.
Claim 2
Dependent Claim
152 words
An electro-optical modulator comprising: a plurality of plates of a material which exhibits an electrooptical effect; a first and a second major surface associated with each plate; a fast axis and a retard axis in orthogonal relationship associated with each of said plurality of plates; means for stacking said plurality of plates so that alternate plates are similarly aligned and adjacent plates oppositely aligned with respect to their fast and retard axes, so that the electro-optical effects of the plates are additive; a first conductor connected to said first major surface and a second conductor connected to said second major surface; a first and second terminal; means connecting the first conductor of alternate plates and the second conductor of the plates adjacent to said alternate plates to said first terminal; and means for connecting the second conductor of said alternate plates and the first conductor of adjacent plates to said second terminal.
Claim 3
Dependent Claim
23 words
An electro-optical modulator according to claim 1 wherein an annular recess and a recessed tail are provided on each of said major surfaces.
Claim 4
Dependent Claim
16 words
An electro-optical modulator according to claim 2 wherein said conductors are set in said annular recesses.
Claim 5
Dependent Claim
18 words
An electro-optical modulator according to claim 2 wherein said recessed tail extends across the width of said plate.
Claim 6
Dependent Claim
18 words
An electro-optical modulator according to claim 1 wherein adjacent surfaces of said plates are cemented into optical contact.
Claim 7
Dependent Claim
22 words
An electro-optical modulator according to claim 1 wherein said plurality of plates are constructed so as to be identical one with another.
Claim 8
Dependent Claim
24 words
An electro-optical modulator according to claim 1 wherein said material is a crystal of the class which includes KDP-ADP type crystals and their isomorphs.
References Cited (Backward Citations)
US3407017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |