DYNAMIC LINEWIDTH OF TUNNELING INJECTION-LASER

The dynamic linewidth of the recently demonstrated tunnelling injectio n-laser is investigated. A significantly smaller dynamic linewidth is measured for this laser in comparison to the separate confinement hete rostructure laser. A lower gain compression coefficient for this laser , deduced from measurements of the linewidth enhancement factor and th e photon lifetime, is mainly responsible for reducing its dynamic line width, owing to the suppression of hot carrier effects by the tunnelli ng injection mechanism.