Patent ID: 6625190
Filing Date: 2003-09-23
Classification: B82Y,H01S

Abstract:
A semiconductor laser device comprising:an active region which is made of an aluminum-free material, and includes a quantum well layer and at least one optical waveguide layer; and a plurality of cladding layers made of at least one AlGaAs or AlGaInP material, wherein at least one of said cladding layers is positioned above said active region and at least one other of said cladding layers is positioned below said active region; wherein a portion of said at least one optical waveguide layer located on one side of said quantum well layer has a thickness of 0.25 &mgr;m or more, and said at least one optical waveguide layer, other than said portion of the at least one optical waveguide layer, has a thickness of at least 10 nm and is doped with impurity of 1017 cmâˆ’3 or more, and wherein said laser device is of an index-guided structure.