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:
Feb. 21, 1995
Filed:
Apr. 07, 1994
Applicant:
Inventor:
Akio Makuta, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 96 ; 372102 ; 372 45 ; 372 26 ;
Abstract
A laser element has a first periodic structure (i.e., a diffraction grating) provided along an optical waveguide, and optical feedback is performed by the first periodic structure. Structural factors, including at least one of the width, thickness and refractive index of the optical waveguide, the composition of the laser medium, or the period of the first periodic structure is continuously changed at least in part in the axial direction of a cavity In such a manner that the continuous change provides a periodic structure of second, third or higher order.