Patent ID: 6522676
Filing Date: 2003-02-18
Classification: B82Y,H01S

Abstract:
A nitride semiconductor laser device, comprising:a first cladding layer formed on a substrate and made from a first conductive-type nitride semiconductor, an active layer formed on the first cladding layer, and a second cladding layer formed on the active layer and made from a second conductive-type nitride semiconductor, the second cladding layer including a flat portion formed over the active layer and a dual stripe portion projecting upward from a midportion of the flat portion, a current blocking layer of a first conductive-type nitride semiconductor being formed at each of opposite sides of the dual stripe portion, the dual stripe portion of the second cladding layer including a lower stripe portion formed on the flat portion along a first width extending in cross-section and an upper stripe portion formed on the lower stripe portion along a second width extending in cross-section, the dual stripe portion varying in cross sectional area toward at the flat portion, the rate of variation in the cross sectional area increasing toward a positive direction from the position of a boundary between the upper stripe portion and the lower stripe portion, the first width being larger than the second width.