Transient gain-spectra and bandgap-renormalization dynamics in ultrashort optical pulse excited InGaAs-InGaAsP multi-quantum-well laser structure

Time-development of transient optical net gain spectra of InGaAs-InGaAsP MQW laser structure after ultrashort pulse excitation was measured. With theoretical simulation, the dynamics of carrier density, carrier temperature and bandgap renormalization and their influences on transient gain were investigated.