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US3586872A
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Apparatus including a thin film waveguide for nonlinear interaction of optical waves
Assignee: AT&T Inc
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Filing: 1969-04-21
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Granted: 1971-06-22
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Expires: 1989-04-21
Abstract
Abstract Nonlinear interaction of optical waves is achieved in a thin film waveguide by exciting appropriate modes of the waves to be interacted whereby phase matching is achieved in the substrate between the evanescent fields of the waves. The desired modes are excited by use of internal-reflection prism coupling in the manner described in copending application Ser. No. 793,696 filed Jan. 24, 1969.
Inventors
- 👤 Ping K Tien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:30
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/24; G02B6/26; G02B6/34; G02F; G02F1/00; G02F1/35; G02F1/365; G02F1/353; G02F1/3534; G02F1/37; G02F1/377; G02F1/39; G02F1/395
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
In combination, means forming an optical waveguide comprising a thin film overlying a substrate of different refractive index, the thickness of the film and the indices of refraction of the film and substrate being such as to provide phase-matching conditions in the substrate between the evanescent fields of an input pump wave and a stimulated wave of different wavelength propagating in different order modes in the film, means at one end of the waveguide to launch an input wave in the film to propagate in a desired mode order, and means at the other end of the waveguide for abstracting for utilization the stimulated wave.
Claim 2
Dependent Claim
105 words
In combination, means forming an optical waveguide comprising a thin film overlying a substrate of different refractive index, the thickness of the film and the indices of refraction of the film and substrate being such as to provide phase-matching conditions in the substrate between the evanescent fields of an input pump wave and a stimulated wave of different wavelength propagating in different order modes in the film, means at one end of the waveguide to launch an input wave in the film to propagate in a desired mode order, and means at the other end of the waveguide for abstracting for utilization the stimulated wave.
Claim 3
Dependent Claim
19 words
The combination of claim 1 in which the launching means comprise an internal reflection prism coupled to the waveguide.
Claim 4
Dependent Claim
27 words
The combination of claim 2 in which the abstracting means comprises a second internal reflection prism spaced apart along the waveguide from the first-mentioned iNternal reflection prism.
Claim 5
Dependent Claim
60 words
The combination of claim 1 in combination with a laser providing a coherent light beam which is supplied to the prism at an angle for internal reflection therein at the surface coupled to the waveguide, the angle of incidence of the beam with said surface being adjusted for exciting in the waveguide a light wave of desired propagating mode order.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |