808nm vertical-cavity surface-emitting laser with large aperture

For the carriers-crowded effect in vertical-cavity surface-emitting laser (VCSEL), the injected current passes mainly through the edge of the circular active region, which results in nonuniformity of the output power density and annular facula with a poor central intensity, especially in large aperture VCSEL. How to restrain carriers-crowded effect becomes a technique problem to develop electrically pumped high power large aperture VCSEL. High power 808 nm VCSEL is demonstrated by introducing a novel structure. And an output power of 0.3 W is achieved at 1 A at room temperature under continuous wave operation.