Patent ID: 6855570

Claim:
A method for manufacturing a compound semiconductor laser, comprising, the steps of, in the following order, forming a first stacked layer unit consisting of a III group nitride semiconductor formed on a substrate and including a first cladding layer, forming an active layer consisting of a III group nitride semiconductor, forming a second stacked layer unit consisting of a Ill group nitride semiconductor and including a second cladding layer, forming a ridge portion having a projecting portion of stripe shape within the second stacked layer unit by dry etching, and forming a buried layer at both sides of the ridge portion so that the ridge portion is put within the buried layer, wherein the buried layer consists of an insulating film including at least one or more types of dielectric materials selected from the group including TiO 2 , ZrO 2 , HfO 2 , CeO 2 , In 2 O 3 , Nd 2 O 3 , Sb 2 O 3 , Sn 2 O, Ta 2 O 5 and ZnO.