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:
Mar. 05, 1991
Filed:
Mar. 29, 1990
Shigeru Ohshima, Yokohama, JP;
Mitsuko Nakamura, Kawasaki, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a semiconductor laser apparatus of the invention, a laser beam emitted from a semiconductor laser is collimated by an optical leans, and is subsequently split by a beam splitter in two directions. One split laser beam component is focused on a first photodetector through an optical lens. The other laser beam component is incident on a Fabry-Perot resonator, and is changed in intensity thereby. The laser beam component is then focused on a photodetector through an optical lens. The Fabry-Perot resonator is integrally designed such that dielectric multilayer films are respectively deposited on both the end faces of a crystalized quartz bulk, which is shaped into a columnar shape extending in the C-axis direction, so as to form a pair of reflect filters. Since the bulk is made of crystalized quartz it is not easily influenced by changes in temperature.