Patent ID: 7727792

Claim:
A laser diode epitaxial wafer production method, comprising: supplying, to a heated n-type GaAs substrate, group III and V raw material gases, a carrier gas, and dopant raw material gases; and epitaxially growing, on the n-type GaAs substrate, an n-type cladding layer, an active layer, a p-type cladding layer, and a GaAs cap layer, wherein the epitaxially grown n-type cladding layer, the active layer, and the p-type cladding layer each comprises an AlGaInP-based material and has a double-hetero structure, wherein during the growing of the p-type cladding layer, carbon tetrabromide is supplied as a dopant raw material gas to allow the p-type cladding layer to comprise a carrier concentration in a range of not less than 8.0×10 17 cm −3 and not more than 1.5×10 18 cm −3 , wherein during the growing of the n-type cladding layer, a silicon doping raw material gas is supplied as a dopant raw material gas to dope the n-type cladding layer with silicon, and wherein during the growing of the GaAs cap layer, zinc is supplied as a dopant raw material gas to allow the GaAs cap layer to comprise a carrier concentration in a range of at least 1.0×10 19 cm −3 .