Patent ID: 6628688
Filing Date: 2003-09-30
Classification: H01S

Abstract:
A semiconductor laser device, comprisinga lower cladding layer, an active layer and an upper first cladding layer stacked in this order on a compound semiconductor substrate, a ridge-shaped upper second cladding layer provided on the upper first cladding layer, a light confining layer provided on both sides of the upper second cladding layer, and a contact layer provided on the upper second cladding layer, wherein the device has a laser emitting end face and a reflective end face at both ends thereof with respect to a longitudinal direction of the ridge-shaped upper second cladding layer, and two current non-injection regions each having no contact layer are provided respectively in the vicinity of both of the laser emitting end face and the reflective end face, and wherein a current non-injection length, which is a length of the current non-injection region along the longitudinal direction of the upper second cladding layer, is longer on the laser emitting end face side than on the reflective end face side.