Patent ID: 7633987

Claim:
A semiconductor laser device, comprising: a first semiconductor laser element and a second semiconductor laser element formed on a semiconductor substrate of a first conductivity type, wherein the first semiconductor laser element has a first first-conductivity-type cladding layer, a first active layer including an Al x Ga 1-x As layer (where 0≦x≦1), a first second-conductivity-type cladding layer, and a first contact layer which are sequentially formed on the semiconductor substrate in this order, and has a first end face window structure that is a region including first impurities and formed near an end face, the second semiconductor laser element has a second first-conductivity-type cladding layer, a second active layer including an (Al y Ga 1-y ) z In 1-z P layer (where 0≦y≦1, 0≦z≦1), a second second-conductivity-type cladding layer, and a second contact layer which are sequentially formed on the semiconductor substrate in this order, and has a second end face window structure that is a region including second impurities and formed near an end face, at least one of the first first-conductivity-type cladding layer and the first second-conductivity-type cladding layer contains indium (In), a lower end of the first end face window structure is located above a lower end of the first first-conductivity-type cladding layer, and a distance from a lower end of the first active layer to the lower end of the first end face window structure is shorter than a distance from a lower end of the second active layer to a lower end of the second end face window structure.