Patent US4852961A successfully refreshed from Google Patents.
US4852961A
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US
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Nonlinear optical waveguide device including grating for changing of the wavelength of light
Assignee: Sharp Corp
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Filing: 1988-09-30
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Granted: 1989-08-01
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Expires: 2008-09-30
Abstract
Abstract A device for the changing of the wavelength of light comprising a non-linear optical crystal, first and second optical waveguides that are formed in the non-linear optical crystal, and an introducing means that is positioned adjacent to the second optical waveguide, the light being incident upon the first optical waveguide and propagated within the first optical waveguide, resulting in harmonic light that satisfies the phase-matching conditions, and the harmonic light being introduced, by the introducing means, into the second optical waveguide from which the harmonic light is output.
Inventors
- 👤 Osamu Yamamoto
- 👤 Toshihiko Yoshida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:10
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/374; G02F2201/00; G02F2201/30; G02F2201/302
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
88 words
A device for the changing of the wavelength of light comprising a non-linear optical crystal, first and second optical waveguides that are formed in said nonlinear optical crystal, and an introducing means that is positioned adjacent to said second optical waveguide, said light being incident upon said first optical waveguide and propagated within said first optical waveguide, resulting in harmonic light that satisfies the phase-matching conditions, and said harmonic light being introduced, by said introducing means, into said second optical waveguide from which said harmonic light is output.
Claim 2
Independent Claim
88 words
A device for the changing of the wavelength of light comprising a non-linear optical crystal, first and second optical waveguides that are formed in said nonlinear optical crystal, and an introducing means that is positioned adjacent to said second optical waveguide, said light being incident upon said first optical waveguide and propagated within said first optical waveguide, resulting in harmonic light that satisfies the phase-matching conditions, and said harmonic light being introduced, by said introducing means, into said second optical waveguide from which said harmonic light is output.
Claim 3
Dependent Claim
19 words
A device according to claim 1, wherein said introducing means is a grating layer with a diffraction grating period.
Claim 4
Dependent Claim
14 words
A device according to claim 1, wherein said introducing means is a tapered coupler.
Claim 5
Dependent Claim
83 words
A device according to claim 2, wherein the diffraction grating period of said grating layer is selected so as to satisfy the following equation: ##EQU3## wherein Λ is the diffraction grating period of said grating layer, θ 1 is the incident angle at which said harmonic light is incident upon said grating layer, λis the wavelength of said harmonic light, n s is the refraction index of the atmosphere, q is an integer, and N is the refraction index of said grating layer.
Claim 6
Dependent Claim
19 words
A device according to claim 2, which further comprises a cladding layer that is positioned on said grating layer.
Claim 7
Dependent Claim
18 words
A device according to claim 4, wherein the n S is the refraction index of said cladding layer.
Claim 8
Dependent Claim
33 words
A device according to claim 6, wherein the refraction index N of said grating layer and the diffraction grating period Λ of the grating layer further satisfy the following relationship: N+n.sub.S >λ/Λ>N (2)
References Cited (Backward Citations)
US3660673A
Cited
US3624406A
Cited
US3842289A
Cited
US3831038A
Cited
US3871742A
Cited
US3898585A
Cited
SU612535A1
Cited
US4466694A
Cited
US4427260A
Cited
US4497535A
Cited
US4583818A
Cited
JPS61144609A
Cited
US4796971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |