Room Temperature Lasing at Blue Wavelengths in Gallium Nitride Microcavities

摘要

Lasing action has been demonstrated at blue wavelengths in vertical cavity surface-emitting lasers at room temperature. The microcavity was formed by sandwiching indium gallium nitride multiple quantum wells between nitride- based and oxide-based quarter-wave reflectors. Lasing action was observed at a wavelength of 399 nanometers under optical excitation and confirmed by a narrowing of the line width in the emission spectra from 0.8 nanometer below threshold to less than 0.1 nanometer (resolution limit) above threshold.