An optically pumped blue GaN-based vertical-cavity surface emitting laser employing AlN/GaN and Ta205/SiO2distributed bragg reflectors

The laser action of GaN-based VCSEL with 3-λcavity and hybrid DBR mirrors, consisting of AIN/GaN and Ta
2
O
5
/SiO
2
DBR was achieved under the optical pumping at room temperature. The laser emits 448nm blue wavelength with a linewidth of 0.25nm above threshold.