Patent ID: 6717175
Filing Date: 2004-04-06
Classification: H01S

Abstract:
A semiconductor laser device comprising:a lower cladding layer; a lower optical confinement layer comprising compound semiconductors with a composition continuously changed in a thickness direction; an active layer having a quantum well structure; an upper optical confinement layer comprising compound semiconductors with a composition continuously changed in a thickness direction; an upper cladding layer; and a minute flow rate controllable layer obtained as a result of the control of said flow rate of supplying the minute gas source, said minute flow rate controllable layer is interposed in the interfaces between said lower cladding layer and said lower optical confinement layer, between at least one of (1) said lower optical confinement layer and said active layer, (2) said active layer and said upper optical confinement layer, and (3) said upper optical confinement layer and said upper cladding layer, said lower optical confinement layer and said upper optical confinement layer comprising quaternary compound semiconductors with a composition continuously changed in a thickness direction; and said minute flow rate controllable layer comprising said quaternary compound semiconductors with a composition having a bandgap wavelength of 0.93 to 1.05 &mgr;m interposed at least between said lower optical confinement layer and said lower cladding layer.