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:
Oct. 04, 1994
Filed:
Sep. 02, 1993
Akio Makuta, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A periodic structure is formed along the laser medium in the axial direction of a cavity. One of the end facet of the cavity has high reflectivity and the other end facet has low reflectivity. A phase discontinuous portion of the periodic structure is disposed in position deviated from the central portion of the cavity towards the high-reflectivity end facet. The phase discontinuous portion is formed of a phase shifting portion or a phase shifting area having the same effect as the phase discontinuity. The phase shift .DELTA..PHI. of the phase shifting portion or phase shifting area is set to exceed 3.pi./4 which is represented in terms of the phase of waveguiding light (which corresponds to 3.lambda./8 when the lasing wavelength is .lambda.). Thus, the performances of high power and linearity of light output can be simultaneously achieved.