Patent ID: 7295588
Filing Date: 2007-11-13
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser element that exhibits self-sustained pulsation in a predetermined output region, said semiconductor laser element comprising: a substrate; a first conductive type clad layer formed on said substrate; an active layer formed on said first conductive type clad layer for emitting light by current injection; a second conductive type first clad layer formed on said active layer; and a stripe-shaped second conductive type second clad layer formed on said second conductive type first clad layer in a first direction, in such a manner that the cross-sectional surface of said stripe-shaped second conductive type second clad layer in a direction perpendicular to said first direction has a share having an upper edge and a lower edge that face each other and side edges that connect between said upper edge and said lower edge, where the minimum width thereof is at least 70% but no more than 100% of the maximum width, wherein the angle between each of said side edges and said lower edge of said stripe-shaped second conductive type second clad layer is at least 70° but no more than 100° at a portion that is at least 60% of the upper side of said stripe-shaped second conductive type second clad layer, and wherein the shape of said cross-sectional surface of said stripe-shaped second conductive type second clad layer is any one of the following: