Patent ID: 7801194
Filing Date: 2010-09-21
Classification: B82Y,G11B,H01S

Abstract:
1. A semiconductor laser device having an oscillation wavelength of larger than 760 nm and smaller than 800 nm in which at least a lower clad layer, a lower guide layer, an active region, an upper guide layer and an upper clad layer are supported by a GaAs substrate, the active region having a quantum well structure in which one or more well layers and barrier layers are stacked, wherein said one or more well layers are formed of InGaAsP and said barrier layers are formed of InGaAsP, the barrier layers having a band gap energy larger than that of said one or more well layers, said upper and/or lower guide layer is formed of Al said one or more well layers are compressive strained and said barrier layers are tensile strained, each of the Al upper and lower surfaces of each of the one or more well layers interfaces with an adjacent tensile strained barrier layer, said semiconductor laser device further comprises a GaAs etching stop layer, and said upper clad layer comprises an AlGaAs first upper clad layer and an AlGaAs second upper clad layer with the GaAs etching stop layer therebetween, said AlGaAs second upper clad layer defining a ridge stripe.