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EP0365039A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical waveguide and second harmonic generator

Assignee: Sony Corp
•
Filing: 1989-10-20
•
Granted: —
•
Expires: 2009-10-20
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Abstract

Abstract An optical waveguide apparatus arranged such that a Ta₂O₅-TiO₂ system amorphous thin film (12) is formed on a substrate (11). This optical waveguide apparatus can perform optical waveguiding at high efficiency. Also, an optical waveguide-type second harmonic generator of Cerenkov radiation type arranged such that the amorphous thin film is formed on a non-linear optical crystal substrate. This optical waveguide-type second harmonic generator can efficiently perform the confinement of light, whereby a fundamental wave of near-infrared rays can be received and a second harmonic wave radiated to the substrate side can be obtained with high efficiency. Further, in a second harmonic generator (SHG) in which the amorphous optical waveguide is formed on a surface of an LiNbO₃ non-linear optical crystal substrate (11) on which surface is formed a periodically-­poled region (10), this second harmonic generator can very efficiently generate a light having a wavelength of half of a semiconductor laser light of 0.8 micrometer band by selecting a relationship between the periodically-poled region cycle (Λ) and the thickness ( h ) of the optical waveguide.

Inventors

  • 👤 Hitoshi Tamada
  • 👤 Masaki Saitoh

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 04:47
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/3775; G02F1/353; G02F1/3544; G02F1/3548; G02F1/374; G02F2202/00; G02F2202/20

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 50 words
An optical waveguide comprising: a substrate (1;11); and an optical waveguide (2;12) formed on said substrate,wherein said optical waveguide is a Ta₂O₅-TiO₂-system amorphous thin film in which the amount of Ti relative to the sum of Ti and Ta is selected in a range from 0 to 60 atomic percents.
Claim 2
Dependent Claim 50 words
An optical waveguide comprising: a substrate (1;11); and an optical waveguide (2;12) formed on said substrate,wherein said optical waveguide is a Ta₂O₅-TiO₂-system amorphous thin film in which the amount of Ti relative to the sum of Ti and Ta is selected in a range from 0 to 60 atomic percents.
Claim 3
Dependent Claim 20 words
A second harmonic generator using an optical waveguide according to claim 1, wherein said substrate is a non-linear optical material.
Claim 4
Dependent Claim 64 words
A second harmonic generator according to claim 2, wherein said non-linear optical material substrate is a non-linear optical single crystal Y plate or X plate, said optical waveguide has one wide end face (2a) which is optically coupled to a semiconductor laser (6), and said optical waveguide is tapered to be gradually narrower from said one wide end face to another end face thereof.
Claim 5
Dependent Claim 18 words
A second harmonic generator according to claim 2, wherein said non-linear optical material substrate is an LiNbO₃ substrate.
Claim 6
Dependent Claim 25 words
A second harmonic generator according to claim 2, wherein said non-linear optical material substrate (11) has formed on one surface thereof a periodically-poled region (10).
Claim 7
Dependent Claim 92 words
A second harmonic generator according to claim 5, wherein the relationship between the periodically-poled region cycle Λ of the periodically-poled region and the thickness h of the fundamental waveguide is arranged to fall within a range which is formed by sequentially connecting by a straight line points (2.38, 0.5), (3.5, 0.5), (4.46, 0.16), (2.38, 0.16) and (2.38, 0.5) in (x, y) coordinates in an orthogonal coordinate system in which the periodically-poled region cycle Λ (micrometer) is presented on the x-axis and the thickness h (micrometer) is presented on the y-axis (Fig. 10).
Claim 8
Dependent Claim 15 words
A second harmonic generator according to claim 6, wherein said substrate is an LiNbO₃ substrate.

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