Patent ID: 7447248
Filing Date: 2008-11-04
Classification: H01S

Abstract:
1. A semiconductor laser element, comprising: a first cladding layer with a first conductive type; a second cladding layer with a second conductive type different from the first conductive type, provided on said first cladding layer; an active layer provided between said first and second cladding layers; a light emitting face which corresponds to one end face of said active layer; and a light reflecting face which corresponds to the other end face opposing one end face of said active layer and is arranged such that a first normal line passing through the center thereof is substantially in parallel with a second normal line passing through the center of said light emitting face, wherein said second cladding layer has a ridge portion for forming a refractive index type waveguide of which both end faces correspond to said light emitting face and said light reflecting face respectively, in said active layer, a part of said ridge portion, excluding at least both edges thereof, extending in a direction crossing the first and second normal lines at an angle equal to or less than the complementary angle θc of the total reflection critical angle on the side face of said refractive index type waveguide respectively.