Patent ID: 11881683
Assignee: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 21:
22. A method of fabricating a vertical cavity surface emitting laser (VCSEL), comprising:
(a) performing a growing process in a reaction chamber by growing a distributed Bragg reflector (DBR) stack with a first type of doping over a semiconductor substrate also having the first type of doping, and ending with growing a final GaAs layer;
(b) performing a capping process by depositing a phosphor containing material cap layer over the distributed Bragg reflector (DBR), wherein said phosphor containing material cap layer protects the DBR from forming oxides while exposed to atmospheric conditions;
(c) performing a decomposition process by selectively decomposing the phosphor containing material cap layer by using high temperature desorption; and
(d) performing a regrowing process in which other layers of a vertical cavity surface emitting laser (VCSEL) are fabricated, comprising:
(i) growing a first contact layer with the same type of doping as the DBR;
(ii) growing an undoped active region as gain material;
(iii) growing a second contact layer on the active region with different doping from the first contact layer; and
(iv) growing layers of an upper reflector.