Patent ID: 8437375
Filing Date: 2013-05-07
Classification: H01S

Abstract:
1. A semiconductor laser element, comprising: an active layer comprising a quantum well layer and barrier layers; an n-type carrier blocking layer adjacent to the active layer; an n-type waveguide layer adjacent to the n-type carrier blocking layer on a side opposite to the active layer; an n-type clad layer adjacent to the n-type waveguide layer on the side opposite to the active layer; and a p-type clad layer contiguous to the active layer on a side opposite to the n-type carrier blocking layer; wherein the n-type clad layer has a bandgap width greater than a bandgap width of the n-type waveguide layer, wherein the n-type carrier blocking layer has a bandgap width greater than or equal to bandgap widths of the barrier layers, and wherein the p-type clad layer has a bandgap width greater than the bandgap widths of the barrier layers and the bandgap width of the n-type waveguide layer.