The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 11, 1991
Filed:
Oct. 20, 1989
Hitoshi Tamada, Kanagawa, JP;
Masaki Saitoh, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical waveguide apparatus arranged such that a Ta.sub.2 O.sub.5 -TiO.sub.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.sub.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 .LAMBDA. and a thickness h of an optical waveguide.