Method for producing a semiconductor laser device

摘要

A visible light semiconductor laser device has a double heterojunction structure comprising AlGaInP series semiconductors which is produced on a substrate having an electrode on its rear surface. A a p type GaInP buffer layer is provided between a p type GaAs contact layer and a p type AlGaInP cladding layer. The buffer layer has a constant composition ratio and the energy band gap is smaller at the side of the p type GaAs contact layer than at the p type AlGaInP cladding layer. Thus, an energy band discontinuity between the p type GaAs contact layer and the p type AlGaInP cladding layer are relaxed for operation of the laser at low voltage. The laser is produced by varying the growth conditions, such as temperature or V/III ratio during growth, of the buffer layer to vary the energy band gap within the buffer layer.