Patent ID: 11870212
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Optics (Instruments)
Classification: CPC H | IPC H

Claim 3:
4. A method for manufacturing a semiconductor laser device which includes a mesa having a resonator, comprising:
sequentially forming a first conductivity type contact layer, a first conductivity type cladding layer, an active layer, a second conductivity type cladding layer, and a second conductivity type contact layer on a substrate;
performing dry etching until a portion of the first conductivity type contact layer is exposed and leaving a part of the first conductivity type cladding layer directly above the first conductivity type contact layer to form grooves on both sides of the mesa and an L shape including a side face of the mesa having an end face of the resonator;
masking an etching side face formed by the dry etching and using an etchant having selectivity with respect to the first conductivity type contact layer to wet etch the first conductivity type cladding layer on bottom surfaces of the grooves and the L shape;
forming a first electrode connected to the first conductivity type contact layer at the bottom surface of at least one of the grooves, and
forming a second electrode connected to the second conductivity type contact layer.