Patent ID: 6608850
Filing Date: 2003-08-19
Classification: H01S

Abstract:
A semiconductor laser device, comprising:a semiconductor substrate of a first conductivity type; an active layer having a stripe structure formed on the semiconductor substrate; a first buried layer of a second conductivity type formed on the semiconductor substrate and in a vicinity of the active layer; a second buried layer of the first conductivity type formed on the first buried layer and in the vicinity of the active layer; and a third buried layer of the second conductivity type formed on the second buried layer and in the vicinity of the active layer; wherein: (a) the active layer is sandwiched within the buried layers; and (b) a difference between a refractive index of the first buried layer and a refractive index of the second buried layer is about 0.02 or less, and a difference between the refractive index of the second buried layer and a refractive index of the third buried layer is about 0.02 or less.