Patent ID: 6983004

Claim:
A laser diode, comprising: a substrate having a first conductivity type; a first cladding layer of said first conductivity type provided over said substrate, said first cladding layer having a lattice constant between GaAs and GaP; an active layer formed over said first cladding layer; a second cladding layer of a second conductivity type provided over said active layer, said second cladding layer having said lattice constant; a current-blocking layer of said first conductivity type respectively provided over said second cladding layer; a stripe depression formed in said current-blocking layer; and a third cladding layer of said second conductivity type formed over said current-blocking layer so as to include said stripe depression, said current-blocking layer having a composition represented as (Al x2 Ga 1−x2 ) y2 In 1−y2 As z2 P 1−z2 (0≦x 2 ≦, 1, 0≦y 2 ≦1, 0<z 2 ≦1).