Spectral mode dynamics of short cavity quantum-dot lasers at 1.13 μm

Temporally resolved longitudinal mode dynamics for 6-fold stacked short cavity quantum dot (QD) lasers is investigated in the μsec time-range. Measurements were performed at room temperature and at 100K. After turn-on a red-shift of single longitudinal modes, a blue-shift of the mode groups and a red shift of the mean value of the spectra are observed simultaneously. Temperature dependent leakage loss spectra due to leaky substrate modes are calculated. The blue shift of the mode-grouping, predicted by the theory, is in good agreement with the experimental data.