Patent ID: 6987788
Filing Date: 2006-01-17
Classification: H01S

Abstract:
1. A semiconductor laser device, comprising: a semiconductor substrate; a lower clad layer formed on the semiconductor substrate; a lower guide layer formed on the lower clad layer; an active layer formed on the lower guide layer; an upper guide layer formed on the active layer; and an upper clad layer formed on the upper guide layer, wherein the lower and upper clad layers have the same refractivity, and the lower clad layer includes a high refractivity layer, which is spaced from the lower guide layer by a constant distance and has a refractivity higher than that of the upper clad layer; and wherein the high refractivity layer has an Al content (wt %) of approximately 0.85 to approximately 0.97 times as much as an Al content of the lower clad layer.