Patent ID: 7656918
Filing Date: 2010-02-02
Classification: H01S

Abstract:
1. A semiconductor laser having an n-cladding layer, a first optical guide layer, an active layer, a second optical guide layer, and a p-cladding layer above an InP substrate, wherein the active layer has a Be-containing group II-VI compound semiconductor mixed crystal layer, having a layer constituted with a matrix element identical with that of the Be-containing group II-VI compound semiconductor of the active layer in any one of the following layer configurations (1) to (8): (1) the first optical guide layer, (2) the second optical guide layer, (3) the first optical guide layer, and the second optical guide layer, (4) the n-cladding layer and the first optical guide layer, (5) the second optical guide layer and p-cladding layer, (6) the n-cladding layer, the first optical guide layer, and the second optical guide layer, (7) the first optical guide layer, the second optical guide layer, and the p-cladding layer, (8) the n-cladding layer, the first optical guide layer, the second optical guide layer, and the p-cladding layer; and (8) and a compositional ratio Xb of Be to the layer having Be of the active layer satisfy a relation: