Patent ID: 7016385

Claim:
A semiconductor laser device wherein an n-type (Al e Ga 1-e ) f In 1-f P (0≦e≦1, 0≦f≦1) cladding layer, an active layer comprising a plurality of stacked layers of AlGaInP type material, a p-type (Al x Ga 1-x ) y In 1-y P (0≦x≦1, 0≦y≦1) cladding layer, and a p-type (Al p Ga 1-p ) q In 1-q P (0≦p≦1) 0≦q≦1) intermediate band gap layer are stacked in this order on a substrate, the semiconductor laser device having a current injection region and a current non-injection region, wherein the semiconductor laser device further comprises: an oxide layer formed on a surface of the p-type (Al p Ga 1-p ) q In 1-q P intermediate band gap layer in the current non-injection region; a p-type Al u Ga 1-u As (0≦u≦1) cap layer formed on the p-type (Al p Ga 1-p ) q In 1-q P intermediate band gap layer in the current injection region; and a p-type Al v Ga 1-v As (0≦v≦1) contact layer formed on the oxide layer and the p-type Al u Ga 1-u As cap layer.