Patent ID: 7072372

Claim:
A semiconductor laser device, comprising: a lower cladding layer and an upper cladding layer laminated on an InP substrate; an active layer laminated between the lower and upper cladding layers; a current passing region formed in at least one of the lower cladding layer and the upper cladding layer, said current passing region having a striped pattern extending in an emission direction of a laser beam; and a current blocking region formed of Ga x In 1−x ,As y P 1−y (0<x≦1, 0<y≦1), said current blocking region being formed in at least one of the lower cladding layer and the upper cladding layer on both lateral sides of said current passing region, and having an opposite conductivity type to the at least one of the lower cladding layer and the upper cladding layer surrounding said current blocking region, wherein the laser beam has a wavelength of not smaller than 1200 nm and not larger than 1600 nm, and an output of not smaller than 80 mW.