US3575488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simplified two-coordinate electro-optic prism deflector
Assignee: AT&T Inc
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Filing: 1969-09-17
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Granted: 1971-04-20
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Expires: 1989-09-17
Abstract
Abstract There is disclosed an arrangement of two-coordinate deflectors without the 90* polarization rotator between the stages that was previously thought to be essential. This reduction in the number of optical parts is achieved by mutually rotating only the inclined prism interfaces in the successive stages, while maintaining the crystalline axis orientations and electrode orientations the same in the two stages. The new deflector is easier to align and scatters less light than prior prism deflectors; and it will be useful in multiple-pass light deflectors and optical time-division multiplex communication systems.
Inventors
- 👤 Edward A Ohm
- 👤 Ralph F Trambarulo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/29
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
Apparatus for deflecting the propagation direction of an incident polarized Electromagnetic wave energy beam, said apparatus being of the type comprising first and second compound electro-optic deflection stages, each of said stages including two triangular electro-optic prism elements having like crystalline axes mutually opposed and a pair of electrodes disposed to apply an electric field along said opposed axes, the two prism elements forming an interface inclined to the direction of propagation, said apparatus being characterized in that the pairs of electrodes of said first and second stages are mutually parallel, and the inclined interfaces of said first and second stages have normals lying in mutually orthogonal planes including the direction of propagation.
Claim 2
Dependent Claim
113 words
Apparatus for deflecting the propagation direction of an incident polarized Electromagnetic wave energy beam, said apparatus being of the type comprising first and second compound electro-optic deflection stages, each of said stages including two triangular electro-optic prism elements having like crystalline axes mutually opposed and a pair of electrodes disposed to apply an electric field along said opposed axes, the two prism elements forming an interface inclined to the direction of propagation, said apparatus being characterized in that the pairs of electrodes of said first and second stages are mutually parallel, and the inclined interfaces of said first and second stages have normals lying in mutually orthogonal planes including the direction of propagation.
Claim 3
Dependent Claim
29 words
Apparatus according to claim 1 in which the first and second deflection stages are optically coupled to provide the same polarization of the beam in both of said stages.
Claim 4
Dependent Claim
35 words
Apparatus according to claim 2 in which the second prism element of the first stage and the first prism element of the second stage in the order of light passage therethrough have like crystalline-axis orientations.
References Cited (Backward Citations)
US3439975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |