Patent ID: 6542532
Filing Date: 2003-04-01
Classification: H01S

Abstract:
A semiconductor laser device comprising:an electron carrying layer formed on a semiconductor substrate; an active layer including a first straight active layer region having a first width and a second straight active layer region having a second width, and formed on said electron carrying layer in contact with said active layer, wherein said first straight active layer region is joined to said second active layer region, said second width is narrower than said first width, and said active layer radiates laser light in response to an application of a voltage higher than or equal to a predetermined voltage; wherein said first width and said second width are predetermined such that said laser light in a waveguide mode interferes with said laser light in a radiation mode in said second straight active layer region, and the entire waveguide is a single mode; and a hole carrying layer formed on said active layer in contact with said active layer.