Patent ID: 6847668
Filing Date: 2005-01-25
Classification: H01S

Abstract:
1. A ridge-type semiconductor laser devise, comprising: a lower cladding layer of a first conductivity type formed on a compound semiconductor substrate of said first conductivity type; an active layer stacked on said lower cladding layer; a first upper cladding layer of a second conductivity type different from said first conductivity type which is stacked on the active layer; a second upper cladding layer of said second conductivity type which has a ridge shape and is provided on said first upper cladding layer; current blocking layers provided on said first upper cladding layer alongside said second upper cladding layer and having a single layer structure which changes conductivity type only in a lateral direction such that respective sections that follow and cover substantially the entire sides of said second upper cladding layer are of said second conductivity type, and respective sections that follow said first upper cladding layer are of said first conductivity type; and a contact layer of said second conductivity type provided on said second upper cladding layer and on said current blocking layers alongside said second upper cladding layer.