Patent ID: 6731663
Filing Date: 2004-05-04
Classification: B82Y,H01S

Abstract:
A ridge waveguide type semiconductor laser device comprising:a stacked structure composed of a substrate and layers thereon, including a lower cladding layer, lower optical confinement layer, active layer, upper optical confinement layer, and upper cladding layer built up in the order named, the upper cladding layer having an upper part in the shape of a ridge and a lower part situated on the upper optical confinement layer, wherein said upper part is not in contact with a semiconductor absorbing layer, and the width of the bottom ridge portion of the ridge ranging from 2.5 &mgr;m to 5.0 &mgr;m and the distance from the bottom ridge portion to the active layer being adjusted to a value higher than 0.5 &mgr;m and not higher than 0.8 &mgr;m, said width and distance ranges providing stable fundamental transverse mode operation at power levels above 250 mW.