Patent ID: 8085826
Filing Date: 2011-12-27
Classification: B82Y,C30B,H01S

Abstract:
1. A nitride semiconductor laser device having a lasing wavelength in a range of 430 nm to 540 nm, comprising: an n-type AlGaN clad layer, a GaN layer, a first InGaN light guide layer, a light-emitting layer, a second InGaN light guide layer, an intermediate layer of a nitride semiconductor, a p-type AlGaN layer, and a p-type AlGaN clad layer stacked in this order on a nitride semiconductor substrate, wherein said n-type AlGaN clad layer has an Al composition ratio in a range of 3% to 5% and a thickness in a range of 1.8 μm to 2.5 μm; said first and second InGaN light guide layers have an In composition ratio in a range of 3% to 6%; said first InGaN light guide layer has a thickness in a range of 120 nm to 160 nm and greater than that of said second InGaN light guide layer; and said p-type AlGaN layer is in contact with said p-type AlGaN clad layer and has an Al composition ratio in a range of 10% to 35% and greater than that of said p-type AlGaN clad layer.