Patent ID: 7098064

Claim:
A method for manufacturing a semiconductor laser device including, on a GaAs substrate, at least a first-conductive-type lower cladding layer, a lower guide layer, a quantum well active layer composed of at least one well layer and at least two barrier layers, an upper guide layer and a second-conductive-type upper cladding layer, one on another, wherein at least one layer out of the plurality of layers is a P-based layer formed of group III–V compound semiconductor containing P as a group V element, the method comprising the steps of: subjecting the P-based layer to crystal growth at a first growth temperature; and above the P-based layer, starting growth of an As-based layer formed of group III–V compound semiconductor containing not P but As as a group V element at a growth temperature approximately equal to the first growth temperature, and thereafter furthering the growth while elevating the temperature to a second growth temperature.