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US5022729A Expired / Lapsed US ⏱️ 0.0 years remaining

Optical waveguide and second harmonic generator

Assignee: Sony Corp
•
Filing: 1989-10-20
•
Granted: 1991-06-11
•
Expires: 2009-10-20
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Abstract

Abstract An optical waveguide apparatus arranged such that a Ta 2 O 5 -TiO 2 system amorphous thin film is formed on a substrate. 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 an LiNbO 3 non-linear optical crystal substrate on which surface is formed a periodically-poled region, 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 a periodically-poled region cycle Λ and a thickness h of an optical waveguide.

Inventors

  • 👤 Hitoshi Tamada
  • 👤 Masaki Saitoh

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-27 21:38
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 60 words
An optical waveguide comprising: a substrate; and an optical waveguide formed on said substrate, wherein said optical waveguide is a Ta 2 O 5 -TiO 2 -system amorphous thin film in which an amount of Ti relative to a sum of Ti and Ta is selected in a range from more than 0 to not more than 60 atomic percent.
Claim 2
Dependent Claim 60 words
An optical waveguide comprising: a substrate; and an optical waveguide formed on said substrate, wherein said optical waveguide is a Ta 2 O 5 -TiO 2 -system amorphous thin film in which an amount of Ti relative to a sum of Ti and Ta is selected in a range from more than 0 to not more than 60 atomic percent.
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 62 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 which is optically coupled to a semiconductor laser, and said optical waveguide is tapered to be gradually narrow from said one wide end face to another end face thereof.
Claim 5
Dependent Claim 19 words
A second harmonic generator according to claim 2, wherein said non-linear optical material substrate is an LiNbO 3 substrate.
Claim 6
Dependent Claim 23 words
A second harmonic generator according to claim 2, wherein said non-linear optical material substrate has formed on one surface thereof a periodically-poled region.
Claim 7
Dependent Claim 90 words
A second harmonic generator according to claim 5, wherein a 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 the 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.
Claim 8
Dependent Claim 16 words
A second harmonic generator according to claim 6, wherein said substrate is an LiNbO 3 substrate.

References Cited (Backward Citations)

US3935472A Cited
US4859876A Cited
US4763019A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-06-10 1994-12-10 1995-06-11 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-06-10 1998-12-10 1999-06-11 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-06-10 2002-12-10 2003-06-11 $7700.00 Window Closed / Lapsed

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