Time scale dependent dynamics in InAs/ InP based quantum dot lasers and amplifiers
InAs/InP base quantum dots constitute the gain medium of the most advanced semiconductor lasers and amplifiers. Their superb properties stem from fundamental reasons and major advances in material growth and nano fabrication.
This talk highlights the dynamical properties of these lasers which have three important time scales:
- Several ps which determines the temperature insensitive modulation characteristics where record speeds have been demonstrated.
- 1-2 ps which determines the carrier relaxation dynamics into the quantum dots and the gain nonlinearities.
- Sub 2 fs which is shorter than the coherence time at room temperature and allows for quantum coherent interactions using practical optical amplifiers.
A series of experiments and various models for each of the time scales will be presented and the impact of further developments in quantum dot technologies will be discussed.