Patent ID: 7767480

Claim:
A method of manufacturing a distributed Bragg reflector (DBR) in A III B V compounds with improved optical and electrical characteristics, which involves a growth apparatus containing multiple group III elements and a group V element, and including multiple sources of at least one of said multiple group-III elements (A III ) in the A III B V compound, and which have selected flux rates, wherein the method includes forming a selected DBR structure by sequential exposure of a substrate to predetermined combinations of the elemental sources to produce a pair of DBR layers of compound alloys and a graded region including one or more discrete additional layers between the DBR layers of intermediate alloy composition, wherein exposure durations and combinations of the elemental sources in each exposure are predetermined by DBR design characteristics, and forming at least one of the one or more discrete additional layers with a combination of at least two of the multiple sources of the at least one of the multiple group III elements to have a uniform composition.