Patent ID: 6501090
Filing Date: 2002-12-31
Classification: B82Y,H01L,H01S

Abstract:
A semiconductor laser comprising:a first conduction type stepped substrate having first principal planes of (100) plane or a (n11) A plane (n<7, n is a real number) and a first inclined plane exposing a (n111) A plane (2&lE;n1<7, n1 is a real number); a first conduction type cladding layer which consists of a first layer, a second layer, a third layer, and a fourth layer at least formed in sequence on the stepped substrate; an active layer formed on the fourth layer of the first conduction type cladding layer, and having a second principal planes of (100) plane or the (n11) A plane (n<7, n is the real number) over the first principal planes and a second inclined plane exposing a (n211) A plane (2&lE;n2<7, n2 is the real number); a first layer of a second conduction type cladding layer formed on the active layer; and a second layer of the second conduction type cladding layer formed on the first layer of the second conduction type cladding layer in a region located along the second inclined plane; first conduction type current blocking layers both sides of the second layer of the second conduction type cladding layer in a region located along the second principal planes; wherein, in the perpendicular plane to the traveling direction of light, when an angle of a first growth profile line to the first principal plane, the first growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane, both inclined planes formed along the first inclined plane, of the first layer of the first conduction type cladding layer is &thgr;1, an angle of a second growth profile line to the first principal plane, the second growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane, both inclined planes formed along the first inclined plane, of the second layer of the first conduction type cladding layer is &thgr;2, an angle of a third growth profile line to the first principal plane, the third growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane, both inclined planes formed along the first inclined plane, of the third layer of the first conduction type cladding layer is &thgr;3, and an angle of a fourth growth profile line to the first principal plane, the fourth growth profile line connecting respective lower side lines of an upper inclined plane and a lower inclined plane, both inclined planes formed along the first inclined plane, of the fourth layer of the first conduction type cladding layer is &thgr;4, relationships &thgr;12, &thgr;2>&thgr;3, &thgr;34 are satisfied.