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:
Jan. 03, 2006
Filed:
Jul. 15, 2003
Kimio Tatsuno, Tokyo, JP;
Hiroaki Furuichi, Yokohama, JP;
Kazumi Kawamoto, Yokohama, JP;
Katsumi Kuroguchi, Yokohama, JP;
Kimio Tatsuno, Tokyo, JP;
Hiroaki Furuichi, Yokohama, JP;
Kazumi Kawamoto, Yokohama, JP;
Katsumi Kuroguchi, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A laser diode module includes a laser diode device, a first photo detector part for receiving, first divided light that is a first portion of light when at least one of light emissions of the laser diode device is divided into two portions of light each traveling a different optical path, a second photo detector part for receiving second divided light that is a second portion of light thus divided via at least a wavelength selective member, and a controller which controls the lasing wavelength of the laser diode device on the basis of outputs of the first and second photo detector parts. A beam splitter provided between the laser diode and the wavelength selective member divides light emitted from the laser diode into the first and second divided light and a quarter-wave plate is provided in an optical path between the beam splitter and the wavelength selective member.