Patent ID: 6810059
Filing Date: 2004-10-26
Classification: H01S

Abstract:
A method of manufacturing a semiconductor laser, comprising:(a) forming a lamination film for a stripe by depositing a first semiconductor layer, an active layer including a semiconductor multilayer, and a second semiconductor layer in this order on a substrate, (b) forming a mask by depositing a dielectric film on the lamination film for a stripe and shaping the dielectric film into a predetermined shape so as to form a first dielectric mask, (c) etching the lamination film for a stripe through the first dielectric mask so as to form an active layer stripe, (d) removing the mask, (e) forming a burying layer, and (f) forming a contact layer on the burying layer, wherein in the step of forming the mask, a second dielectric mask also is formed on the lamination film in parallel to the first dielectric mask the second dielectric mask having width varying in a cavity direction and having a narrow width region at the output end and a wide width region provided at least at one portion of the mask other than at the output end, in the step of etching the lamination film for a stripe, the active layer stripe is formed through the first dielectric mask so as to be located just below the first dielectric mask, and at the same time a monitor stripe is formed through the second dielectric mask so as to be located just below the second dielectric mask, and completion of the etching is detected according to disappearance of the active layer in the monitor stripe at an output end of the laser as a criterion, and after the step of forming the contact layer, the active layer stripe is isolated electrically from the monitor stripe by an isolation groove.