Patent ID: 6546035
Filing Date: 2003-04-08
Classification: H01S

Abstract:
A semiconductor laser diode array comprising:a first laser diode including a first cladding layer formed on a substrate from a first semiconductor of a first conductivity type, a first active layer formed on said first cladding layer from a second semiconductor and a second cladding layer formed on said first active layer from a third semiconductor of a second conductivity type; and a second laser diode including a third cladding layer formed from a fourth semiconductor of the first conductivity type on said substrate with a space from said first laser diode, a second active layer formed on said third cladding layer from a fifth semiconductor having a larger energy gap than said first active layer and a fourth cladding layer formed on said second active layer from a sixth semiconductor of the second conductivity type, wherein said second laser diode further includes a height adjusting buffer layer formed between said substrate and said third cladding layer from a seventh semiconductor of the first conductivity type and having a thickness set for placing said second active layer at substantially the same height from a substrate surface as a height from the substrate surface of said first active layer, wherein the composition of the seventh semiconductor that forms the height adjusting buffer layer is different from the composition of the fourth semiconductor that forms the third cladding layer.