Patent ID: 6768759
Filing Date: 2004-07-27
Classification: H01L,H01S

Abstract:
A semiconductor laser device formed on a semiconductor substrate, the laser device comprising:a lower cladding layer having an n type conductivity, formed on a top side of said substrate, an active layer formed on a top side of said lower cladding layer, an upper cladding layer having an type conductivity, formed on a top side of said active layer, a mesa structure formed by said lower cladding layer, said active layer and said upper cladding layer, a first current confinement layer having a p type conductivity, formed at a side of the mesa structure and contacting the lower cladding layer, a second current confinement layer having an n type conductivity, formed at a side of the mesa structure and on a top side of and in contact with said first current confinement layer, wherein the closest distance between the second current-confinement layer and the active layer has a value in the range from 0.15 &mgr;m to 0.6 &mgr;m.