COHERENT EXCITON PHOTON INTERACTION AND PULSE-PROPAGATION EFFECTS OF BOUND EXCITON-STATES IN CDS

Measuring the transform-limited time-resolved spectrum of a coherent l aser pulse allows one to determine the amplitude and phase of the puls e electric field. From the reshaping of pulses transmitted through a t hin semiconductor platelet in resonance with an exciton transition in case of the donor bound exciton in CdS the effects of coherent exciton -photon interaction for different laser intensities can be studied. Wh ile at low intensities the expected polariton beating connected with t he formation of a 0 pi-pulse is observed, at sufficiently high intensi ties changes in the pulse shape occur that are ascribed to self-induce d transparency of the bound exciton states.