Patent ID: 6535536
Filing Date: 2003-03-18
Classification: H01S

Abstract:
A semiconductor laser element comprising:a GaN layer; a lower clad layer; a lower optical waveguide layer; an active layer; an upper optical waveguide layer; an upper clad layer; a GaN contact layer; wherein the lower clad layer, the lower optical waveguide layer, the active layer, the upper optical waveguide layer, the upper clad layer, and the GaN contact layer are laminated on the GaN layer in this order and wherein a current injection window is provided above the active layer, further comprising a first AlGaN composition gradient layer which is provided between the GaN layer and the lower clad layer so that a band gap thereof continuously changes from the GaN layer to the lower clad layer; and a second AlGaN composition gradient layer which is provided between the upper clad layer and the GaN contact layer so that a band gap thereof continuously changes from the upper clad layer to the GaN contact layer.