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:
Apr. 11, 1989
Filed:
Apr. 15, 1987
Nobuo Hori, Tokyo, JP;
Tokyo Kogaku Kikai Kabushiki Kaisha, Tokyo, JP;
Abstract
An apparatus for stabilizing the wavelength/output power of a semiconductor laser is disclosed. It includes an injection current supplying source for supplying an injection current to a single-mode semiconductor laser; an output power variation detecting portion for detecting the variation of the output power; a wavelength variation detecting portion which has a light receiving portion for receiving a part of the output power of the semiconductor laser through an optical element whose spectral characteristics are varied in the wavelength area of the semiconductor laser and a processing portion for obtaining a variation of the wavelength of the semiconductor laser; an operating temperature stabilizing portion which comprises an operating temperature detecting portion and adapted to detect an operating temperature thereof, a thermoelectric element for forwarding and receiving heat to and from the semiconductor laser, and an operating temperature controlling portion for controlling the thermoelectric element, an output of the heat value detecting portion, and an output of the output power variation detecting portion; and an injection current controlling portion for controlling the injection current of the injection current source.