Patent ID: 9203216
Filing Date: 2015-12-01
Classification: H01S

Abstract:
1. A semiconductor laser device comprising: a semiconductor substrate of a first conductivity type; a cladding layer of the first conductivity type laminated on the semiconductor substrate; a first light guiding layer laminated on the cladding layer of the first conductivity type; an active layer laminated on the first light guiding layer; a second light guiding layer laminated on the active layer; a cladding layer of a second conductivity type laminated on the second light guiding layer, wherein the sum of thickness of the first light guiding layer and thickness of the second light guiding layer is such that first and higher order vertical modes of oscillation, in a direction of crystal growth of the first light guiding layer and the second light guiding layer, are supported, and the thickness of the first light guiding layer is larger, than the thickness of the second light guiding layer; and a first low refractive index layer having a refractive index lower than refractive index of the cladding layer of the first conductivity type and located between the cladding layer of the first conductivity type and the first light guiding layer.