Patent ID: 7042011

Claim:
A compound semiconductor laser, comprising, a first stacked layer unit consisting of a III group nitride semiconductor formed on a substrate and including a first cladding layer, an active layer consisting of a III group nitride semiconductor formed on the first stacked layer unit, a second stacked layer unit consisting of a III group nitride semiconductor formed on the active layer and including a second cladding layer, a ridge portion having a projecting portion of stripe shape within the second stacked layer unit, and a buried layer formed on the second stacked layer unit 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 consisting of 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; and wherein the first stacked layer unit and/or second stacked layer unit includes a light confining layer.