Patent ID: 7288793
Filing Date: 2007-10-30
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser comprising: a semiconductor substrate; a light emitting layer forming section including a first conductivity type clad layer, an active layer, a second conductivity type first clad layer, a second conductivity type second clad layer, a second conductivity type cap layer on the second conductivity type second clad layer, the second clad layer and the cap layer being etched on both sides to form a ridge, and a first conductivity type current block layer that is embedded on the both sides of the second conductivity type second clad layer and the cap layer, which are laminated on the semiconductor substrate; and a contact layer laminated on the cap layer and the current block layer directly and made of a material having substantially the same lattice constant and thermal expansion coefficient as those of the semiconductor substrate; wherein the light emitting layer forming section and the contact layer being formed in such a manner as to satisfy an inequality: 1.5≦(d