Emission characteristics of optically pumped GaN-based vertical-cavity surface-emitting lasers

Abstract

The laser emission characteristics of a GaN-based vertical-cavity surface-emitting laser with two dielectric distributed Bragg reflectors were investigated under optically pumped operation at room temperature. The laser emitted wavelength at 415.9nm with an emission linewidth of 0.25nm and threshold pumping energy of 270nJ. The laser has a high characteristic temperature of about 278K and high spontaneous emission coupling factor of 10−2. The laser emission showed single and multiple spot emission patterns with spectral and spatial variations under different pumping conditions.