Patent ID: 7031361

Claim:
An edge emitting laser with circular beam, comprising: a substrate; and an epitaxy structure, which is formed on the upper surface of the substrate to form a ridge waveguide and includes, from bottom to top, a bottom cladding layer, a bottom waveguide layer, a light-emitting layer, an upper waveguide layer, an upper cladding layer, and an electrode contact layer; wherein the light-emitting layer is formed from a low-carrier-mobility material that contains diluted nitrides, the ridge waveguide is formed by etching from the surface of the epitaxy structure through the light-emitting layer, and the low-carrier-mobility material is In v Ga w Al 1-v-w As x P y N z Sb 1-x-y-z with 0<v,w,x,y,z<1.