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EP0355915A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Frequency doubling device

Assignee: Koninklijke Philips NV
•
Filing: 1989-08-16
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Granted: —
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Expires: 2009-08-16
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Abstract

Abstract A device for doubling the frequency (ω) of electromagnetic radiation. The device includes a non-­linear substrate (12) having a non-linear optical waveguide (14, 16) of a differing refractive index disposed thereon. The waveguide layer includes an inverted polarization interface (18) at which the direction of polarization of the waveguide (14, 16) abruptly changes in sign. Radiation directed across the device parallel to the plane of the inverted polarization inter­face (18) will be doubled in frequency by the interface. The inverted polarization interface (18) may be achieved in a number of ways. The interface (18) may be directly grown on the substrate (12) 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 (18).

Inventors

  • 👤 Jacob Khurgin

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 06:59
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 36 words
A frequency doubling device as claimed in Claim 1 comprising first and second waveguide layers which are arranged face to face in juxtaposition having opposed polarization dipoles, thereby forming said inverted polari­zation interface in between them.
Claim 4
Dependent Claim 36 words
A frequency doubling device as claimed in Claim 1 or 2 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 29 words
A frequency doubling device as claimed in Claim 2 or 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
A 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 20 words
A frequency doubling device as claimed in Claim 1, 2 or 3 wherein said waveguide is formed from zinc selenide.
Claim 8
Dependent Claim 30 words
A frequency doubling device as claimed in Claim 1, 2 or 3 wherein said waveguide layer is formed from zinc sulfur selenide of the formula ZnS x Se 1-x .
Claim 9
Dependent Claim 17 words
A frequency doubling device as claimed in any of the preceding Claims wherein said substrate comprises KTP.
Claim 10
Independent Claim 49 words
A method for doubling the frequence 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 frequency in a direction parallel to said inverted polarization interface.
Claim 11
Independent Claim 49 words
A method for doubling the frequence 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 frequency in a direction parallel to said inverted polarization interface.

References Cited (Backward Citations)

US982135A Cited
US3746879A Cited
US3988593A Cited
GB1594387A Cited

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