PULSE-PROPAGATION-INDUCED HIGHER ORDERS OF DIFFRACTION IN TRANSIENT 4-WAVE-MIXING WITH SEMICONDUCTORS

Higher orders of diffraction observed in a transient four-wave mixing experiment with acceptor-bound exciton complexes in CdS are analyzed i n terms of pulse propagation. The description is based on a mean-field correction to the driving electric field in the optical Bloch equatio ns, which are shown to generally lack higher-order diffraction for two -pulse self-diffraction. A propagation-induced sequence of stimulated echoes diffracted at the population grating dominates at least the sec ond order of diffraction.