Patent ID: 7133430
Filing Date: 2006-11-07
Classification: B82Y,H01S

Abstract:
1. An AlGaAs-based ridge-stripe semiconductor laser element having a stacked structure formed on a GaAs substrate, said stacked structure comprising: an Al a non-doped active layer section having an Al an Al an Al a GaAs contact layer having a conductivity type opposite to said substrate, wherein said second cladding layer, said third cladding layer and said contact layer are formed as a stripe-patterned ridge, and an Al compositional ratio “z” of said etching stop layer, an Al compositional ratio “x” of said first cladding layer and said second cladding layer, and an Al compositional ratio “y” of said third cladding layer satisfy the relations x<z and x<y, where a difference between “x” and “z” is set to 0.025 or more.