Patent ID: 6018539
Filing Date: 2000-01-25
Classification: H01S

Abstract:
A semiconductor laser comprising:a first conductivity type semiconductor substrate having a front surface and a gain region and a spot size changing region arranged adjacent each other on the front surface;a first conductivity type lower cladding layer disposed on the front surface of said substrate;an active layer disposed on said lower cladding layer and having a thickness which is uniform in said gain region and gradually decreases in said spot size changing region with distance from said gain region;a second conductivity type upper cladding layer disposed on said active layer and having a stripe-shaped ridge, said ridge extending along said gain region and said spot size changing region;a second conductivity type contact layer disposed on said upper cladding layer;a first electrode disposed on said ridge of said upper cladding layer on said second conductivity type contact layer; anda second electrode disposed on a rear surface of said substrate.