Patent ID: 6618415
Filing Date: 2003-09-09
Classification: H01S

Abstract:
A semiconductor laser device comprising:an n-type first cladding layer, an active layer, and a p-type second cladding layer stacked on or above an n-type semiconductor substrate, wherein the second cladding layer comprises carbon as a p-type impurity at a concentration of 2Ã—1017 cmâˆ’3 to 2Ã—1018 cmâˆ’3; wherein an n-type current block layer having a stripe-shaped groove is provided on or above the second cladding layer, at least a p-type third cladding layer is formed on the current block layer including the stripe-shaped groove, and the carbon concentration of the second cladding layer is 3Ã—1017 cmâˆ’3 to 2Ã—1018 cmâˆ’3; and wherein the impurity concentration of the second cladding layer is higher in a region of the second cladding layer that faces the groove than in remaining regions of the second cladding layer.