Patent ID: 9312661
Filing Date: 2016-04-12
CPC Classification: B82Y,H01S

Claim Text:
1. A nitride semiconductor laser element comprising: an n-type semiconductor layer comprising an n-side optical guide layer; a p-type semiconductor layer; and an active layer disposed between the n-type semiconductor layer and the p-type semiconductor layer, the active layer comprising two or more well layers, and at least one barrier layer disposed between the well layers, wherein the p-type semiconductor layer comprises an electron barrier layer having band gap energy higher than that of all barrier layers comprised in the active layer, wherein a p-side optical guide layer is disposed between a final well layer and the electron barrier layer, the final well layer being a well layer nearest to the p-type semiconductor layer of the two or more well layers, wherein the p-side optical guide layer comprises a composition graded layer of Al wherein a region of the composition graded layer on a side of the final well layer has a lower band gap energy than that of the barrier layer.