US5218661A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for doubling the frequency of a light wave
Assignee: US Philips Corp
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Filing: 1991-11-05
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Granted: 1993-06-08
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Expires: 2011-11-05
Abstract
Abstract A device for doubling the frequency of a light wave and having a satisfactory waveguide action is obtained in a simple manner by providing, in a nonlinear optical material 11, periodic domains 12 having a reduced second-order susceptibility and an increased refractive index relative to the nonlinear optical material by means of proton exchange or proton implantation. By means of a heat treatment, the refractive index of the material in the periodic domains is reduced to a value which is less than 0.10 higher than that of the nonlinear optical material, thus obtaining a low degree of light scattering.
Inventors
- 👤 Richard B. J. Droste
- 👤 Ronald R. Drenten
- 👤 Michiel J. Jongerius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:15
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/3775; G02F1/355; G02F1/3558; G02F2202/00; G02F2202/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
A device for doubling the frequency of a light wave, which device comprises a nonlinear optical medium for guiding a fundamental light wave while forming a second harmonic wave, said medium comprising a waveguide having a spatially periodic structure, characterized in that the waveguide consists of a nonlinear optical material in which periodic domains having a reduced second-order susceptibility and an increased refractive index relative to the nonlinear optical material are provided by means of proton exchange or proton implantation, the increase of the refractive index being less than 0.10.
Claim 2
Independent Claim
90 words
A device for doubling the frequency of a light wave, which device comprises a nonlinear optical medium for guiding a fundamental light wave while forming a second harmonic wave, said medium comprising a waveguide having a spatially periodic structure, characterized in that the waveguide consists of a nonlinear optical material in which periodic domains having a reduced second-order susceptibility and an increased refractive index relative to the nonlinear optical material are provided by means of proton exchange or proton implantation, the increase of the refractive index being less than 0.10.
Claim 3
Dependent Claim
23 words
A device as claimed in claim 1, characterized in that the increase of the refractive index in the domains is 0.02 to 0.06.
Claim 4
Dependent Claim
31 words
A device as claimed in claim 1, characterized in that the nonlinear optical material consists material selected from the group of lithium niobate LiNbO 3 and lithium tantalate LiTaO 3 .
References Cited (Backward Citations)
US5011250A
Cited
WO1990004807A1
Cited
US5036220A
Cited
US5036220B1
Cited
US5052770A
Cited
US5121250A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |