Patent US4704637A successfully refreshed from Google Patents.
Patent US4838638A successfully refreshed from Google Patents.
US4838638A
Expired / Lapsed
US
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Optical wavelength conversion device
Assignee: Fujifilm Holdings Corp
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Filing: 1988-02-16
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Granted: 1989-06-13
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Expires: 2008-02-16
Abstract
Abstract An optical wavelength conversion device is composed of a nonlinear optical material, and a first cladding layer having a refractive index lower than the refractive index of the nonlinear optical material and covering the nonlinear optical material, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic, to guide the second harmonic through the first cladding layer, and to radiate the second harmonic. A second cladding layer formed of a material having a refractive index lower than the refractive index of the first cladding layer is provided outside of the first cladding layer, thereby to protect the first cladding layer.
Inventors
- 👤 Kozi Kamiyama
- 👤 Yoji Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:48
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/374; G02F1/383
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
An optical wavelength conversion device composed of an organic nonlinear optical material, and a first cladding layer disposed outside the nonlinear optical material and having a refractive index lower than the refractive index of the organic nonlinear optical material and covering the organic nonlinear optical material, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic, to guide the second harmonic through the first cladding layer, and to radiate the second harmonic, wherein the improvement comprises a second cladding layer formed of a material having a refractive index lower than the refractive index of said first cladding layer, said second cladding layer being formed outside said first cladding layer, wherein the refractive index n 2 .sup.ω of said first cladding layer with respect to said fundamental wave and the refractive index n 3 2 ω of said second cladding layer with respect to said second harmonic satisfy the relationship expressed as n 2 .sup.ω <n 3 2 ω.
Claim 2
Dependent Claim
164 words
An optical wavelength conversion device composed of an organic nonlinear optical material, and a first cladding layer disposed outside the nonlinear optical material and having a refractive index lower than the refractive index of the organic nonlinear optical material and covering the organic nonlinear optical material, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic, to guide the second harmonic through the first cladding layer, and to radiate the second harmonic, wherein the improvement comprises a second cladding layer formed of a material having a refractive index lower than the refractive index of said first cladding layer, said second cladding layer being formed outside said first cladding layer, wherein the refractive index n 2 .sup.ω of said first cladding layer with respect to said fundamental wave and the refractive index n 3 2 ω of said second cladding layer with respect to said second harmonic satisfy the relationship expressed as n 2 .sup.ω <n 3 2 ω.
Claim 3
Dependent Claim
72 words
A device as defined in claim 1 wherein said organic nonlinear optical material is filled between a pair of said first cladding layers having a refractive index lower than the refractive index of said nonlinear optical material, and a pair of said second cladding layers formed of a material having a refractive index lower than the refractive index of each of said first cladding layers are formed outside said first cladding layers.
Claim 4
Dependent Claim
62 words
A device as defined in claim 2 wherein at least one of said first cladding layers is provided with one of a grating for entry of said fundamental wave, which is formed on an inner surface facing said organic nonlinear optical material and a grating for radiation of said second harmonic, which is formed on an outer surface opposite said inner surface.
Claim 5
Dependent Claim
21 words
A device as defined in claim 3 wherein said grating for radiation of said second harmonic is a focusing grating coupler.
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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) | 1992-06-12 | 1992-12-12 | 1993-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-12 | 1996-12-12 | 1997-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-12 | 2000-12-12 | 2001-06-13 | $7700.00 | Window Closed / Lapsed |