Fig. 1. Scanning electron microscopy (SEM) image of microdisk laser and transmission electron microscopy (TEM) images of the active region cross section.

Fig. 2. Emission spectra below (dotted line) and above (solid line) the lasing threshold; inset: mode linewidth versus normalized current.

Fig. 3. Integrated intensity of the dominant mode (circles) and total emitted power (triangles) as functions of current and current voltage characteristic (squares) of a microdisk laser. Arrow denotes the lasing threshold.

Fig. 4. Experimental (symbols) and fitted (curve) small signal modulation responses at different bias currents.

Fig. 5. Experimental data at 3 dB bandwidth (solid symbols) and relaxation oscillation frequency (open symbols) against the squared root of the injection current.

Fig. 6. Squared relaxation oscillation frequency against the lasing power. Line is a guide for the eye.

Fig. 7. Experimental (symbols) and fitted (curve) damping factor versus squared relaxation oscillation frequency.