US4896931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency doubling device
Assignee: Philips North America LLC
•
Filing: 1988-08-18
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Granted: 1990-01-30
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Expires: 2008-08-18
Abstract
Abstract A device for doubling the frequency of electromagnetic radiation. The device includes a non-linear substrate having a non-linear optical waveguide of a differing refractive index disposed thereon. The waveguide layer includes an inverted polarization interface at which the direction of polarization of the waveguide abruptly changes in sign. Radiation directed across the device parallel to the plane of the inverted polarization interface will be doubled in frequency by the interface. The inverted polarization interface may be achieved in a number of ways. The interface may be directly grown on the substrate or a single layer waveguide may be cleaved and flipped over upon itself. Finally, the waveguide may be formed by the growth of asymmetric mirror image quantum wells on either side of a plane to form the interface.
Inventors
- 👤 Jacob Khurgin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
61 words
A frequency doubling device comprising: (a) a non-linear optical substrate; (b) a non-linear optical waveguide disposed on said substrate, said waveguide having a refractive index differing from that of said substrate; (c) said non-linear waveguide having an inverted polarization interface disposed therein; and (d) means for directing electromagnetic radiation across said waveguide in a direction parallel to said inverted polarization interface.
Claim 2
Dependent Claim
61 words
A frequency doubling device comprising: (a) a non-linear optical substrate; (b) a non-linear optical waveguide disposed on said substrate, said waveguide having a refractive index differing from that of said substrate; (c) said non-linear waveguide having an inverted polarization interface disposed therein; and (d) means for directing electromagnetic radiation across said waveguide in a direction parallel to said inverted polarization interface.
Claim 3
Dependent Claim
31 words
The frequency doubling device as claimed in claim 1 wherein said inverted polarization interface is formed by face to face juxtaposition of first and second waveguide layers having opposed polarization dipoles.
Claim 4
Dependent Claim
34 words
The frequency doubling device as claimed in claim 1 wherein said inverted polarization interface is formed by growing a waveguide of a first polarity and thereafter growing a waveguide of a second opposite polarity.
Claim 5
Dependent Claim
27 words
The frequency doubling device as claimed in claim 3 further including a relatively thin layer of neutral polarity material disposed between said first and second polarity waveguides.
Claim 6
Dependent Claim
26 words
The frequency doubling device as claimed in claim 1 wherein said inverted polarization interface comprises asymmetric mirror image quantum wells disposed about said inverted polarization plane.
Claim 7
Dependent Claim
17 words
The frequency doubling device as claimed in claim 1 wherein said waveguide is formed from zinc selenide.
Claim 8
Dependent Claim
27 words
The frequency doubling device as claimed in claim 1 wherein said waveguide layer is formed from zinc sulfur selenide of the formula ZnS x Se 1-x .
Claim 9
Dependent Claim
14 words
The frequency doubling device as claimed in claim 1 wherein said substrate comprises KTP.
Claim 10
Independent Claim
47 words
A method for doubling the frequency of electromagnetic radiation comprising the steps of: (a) providing a non-linear waveguide disposed on a substrate, said waveguide including an inverted polarization interface; and (b) passing the electromagnetic radiation to be doubled in a direction parallel to said inverted polarization interface.
Claim 11
Independent Claim
47 words
A method for doubling the frequency of electromagnetic radiation comprising the steps of: (a) providing a non-linear waveguide disposed on a substrate, said waveguide including an inverted polarization interface; and (b) passing the electromagnetic radiation to be doubled in a direction parallel to said inverted polarization interface.
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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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |