Patent ID: 7606280
Filing Date: 2009-10-20
Classification: H01S

Abstract:
1. A method for producing a multi-wavelength semiconductor laser device, comprising the steps of: preparing a substrate for growth of a nitride single crystal thereon; sequentially growing a first conductivity-type first clad layer, a first active layer and a second conductivity-type first clad layer on the substrate, to form a first nitride epitaxial layer; selectively removing the first nitride epitaxial layer such that a portion of the substrate is exposed; sequentially growing a first conductivity-type second clad layer, a second active layer and a second conductivity-type second clad layer on the exposed portion of the substrate, to form a second nitride epitaxial layer; separating the first and second nitride epitaxial layers from the substrate; attaching the separated first and second nitride epitaxial layers to a first conductivity type substrate; selectively etching the first and second nitride semiconductor epitaxial layers to expose a portion of the first conductivity-type substrate and to form first and second semiconductor laser structures from the first and second nitride epitaxial layers, respectively, the first and second semiconductor laser structures being separated from each other; sequentially growing a first conductivity-type third clad layer, a third active layer and a second conductivity-type third clad layer on the exposed portion of the first conductivity-type substrate, to form a third semiconductor laser structure; and forming a first electrode connected to a bottom surface of the first conductivity-type substrate and forming second electrodes connected to the respective second conductivity-type clad layers of the first, second and third semiconductor laser structures.