EP0254921A2
Expired / Lapsed
EP
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Optical wavelength conversion device, and a method of making the same
Assignee: Fujifilm Holdings Corp
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Filing: 1987-07-07
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Granted: —
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Expires: 2007-07-07
Abstract
Abstract An Optical wavelength conversion device is constituted by a pair of substrates disposed facing each other, and an optical waveguide formed of a nonlinear optical material and disposed between the substrates, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic which is phase matched by Cherenkov radiation. At least one of the substrates is provided with a grating for entry of the fundamental wave, which is formed on a surface contacting the optical waveguide, and/or with a grating for radiation of the second harmonic, which is formed on a surface opposite to the surface contacting the optical waveguide. The optical wavelength conversion device is made by forming grooves on the substrates, filling a slight space between the substrates with a crystallizable organic nonlinear optical material, and gradually crystallizing the optical material.
Inventors
- 👤 Shinsuke Umegaki
- 👤 Yoji Okazaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 05:41
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/374
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
An optical wavelength conversion device constituted by a pair of substrates disposed facing each other, and an optical waveguide formed of a nonlinear optical material and disposed between the substrates, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic which is phase matched by Cherenkov radiation, wherein the improvement comprises providing at least one of said substrates with a grating for entry of said fundamental wave, which is formed on a surface contacting said optical waveguide, and/or with a grating for radiation of said second harmonic, which is formed on a surface opposite to said surface contacting said optical waveguide.
Claim 2
Dependent Claim
107 words
An optical wavelength conversion device constituted by a pair of substrates disposed facing each other, and an optical waveguide formed of a nonlinear optical material and disposed between the substrates, thereby to convert a fundamental wave entering the optical wavelength conversion device to a second harmonic which is phase matched by Cherenkov radiation, wherein the improvement comprises providing at least one of said substrates with a grating for entry of said fundamental wave, which is formed on a surface contacting said optical waveguide, and/or with a grating for radiation of said second harmonic, which is formed on a surface opposite to said surface contacting said optical waveguide.
Claim 3
Independent Claim
20 words
A device as defined in Claim l wherein said optical waveguide is formed of a crystallizable organic nonlinear optical material.
Claim 4
Dependent Claim
53 words
A device as defined in Claim 2 wherein said optical waveguide is constituted by a plurality of optical material single crystal sections disposed side by side in the width direction of said two gratings, and said two gratings are optically coupled with each other by each of said optical material single crystal sections.
Claim 5
Independent Claim
24 words
A device as defined in Claim l, 2 or 3 wherein said grating for radiation of said second harmonic is a focusing grating coupler.
Claim 6
Independent Claim
159 words
A method of making an optical wavelength conversion device, which comprises the steps of: i) forming a plurality of grooves side by side in spaced relation to each other on one surface of at least one of two substrates, ii) securing said two substrates to each other so that they face each other in slightly spaced relation to each other with said one surface facing inward, iii) filling the slight space between said two substrates with a crystallizable organic nonlinear optical material having a refractive index higher than the refractive index of the substrate material, and iv) gradually drawing said substrates from inside of a furnace kept at a temperature higher than a melting point of said crystallizable organic nonlinear optical material to the outside kept at a temperature lower than said melting point, thereby to cause said crystallizable organic nonlinear optical material in the molten condition to crystallize from a drawing-out section to the outside of said furnace.
Claim 7
Independent Claim
159 words
A method of making an optical wavelength conversion device, which comprises the steps of: i) forming a plurality of grooves side by side in spaced relation to each other on one surface of at least one of two substrates, ii) securing said two substrates to each other so that they face each other in slightly spaced relation to each other with said one surface facing inward, iii) filling the slight space between said two substrates with a crystallizable organic nonlinear optical material having a refractive index higher than the refractive index of the substrate material, and iv) gradually drawing said substrates from inside of a furnace kept at a temperature higher than a melting point of said crystallizable organic nonlinear optical material to the outside kept at a temperature lower than said melting point, thereby to cause said crystallizable organic nonlinear optical material in the molten condition to crystallize from a drawing-out section to the outside of said furnace.
Claim 8
Dependent Claim
40 words
A method as defined in Claim 5 wherein said grooves are formed on both the two substrates, and said substrates are secured so that the grooves formed on one of said substrates face the grooves formed on the other thereof.
References Cited (Backward Citations)
No citation records indexed.
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