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:
Sep. 12, 2006
Filed:
Mar. 04, 2004
Hiromasu Matsuoka, Itami, JP;
Yasuhiro Kunitsugu, Tokyo, JP;
Harumi Nishiguchi, Tokyo, JP;
Tetsuya Yagi, Tokyo, JP;
Yasuyuki Nakagawa, Tokyo, JP;
Junichi Horie, Tokyo, JP;
Hiromasu Matsuoka, Itami, JP;
Yasuhiro Kunitsugu, Tokyo, JP;
Harumi Nishiguchi, Tokyo, JP;
Tetsuya Yagi, Tokyo, JP;
Yasuyuki Nakagawa, Tokyo, JP;
Junichi Horie, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A low reflective film is formed of, in sequence from a side in contact with a laser chip, a first dielectric film of a refractive index nand a thickness d, a second dielectric film of a refractive index nand a thickness d, a third dielectric film of a refractive index nand a thickness d, and a fourth dielectric film of a refractive index nand a thickness d, specifically, aluminum oxide AlOwith a refractive index n=1.638 is used for the first dielectric film, silicon oxide SiOwith a refractive index n=n=1.489 for the second and fourth dielectric films, tantalum oxide TaOwith a refractive index n=2.063 for the third dielectric film, respectively, resulting in a semiconductor laser device with a reflectance which is stably controllable.