T. Mishina et Y. Masumoto, COHERENT PROPAGATION OF FEMTOSECOND OPTICAL PULSES IN A MONOCLINIC ZNP2 SINGLE-CRYSTAL, Physical review letters, 71(17), 1993, pp. 2785-2788
The free induction decay signal from excitons in a ZnP2 single crystal
shows an unexpected temporal evolution, polariton beat, and coherent
dip. We show that the effects come from a nonzero thickness of the sam
ple and nonzero time width of the excitation pulses. A systematic nume
rical calculation provides good qualitative agreement with the data. T
hese effects are very important in understanding the experimental resu
lts which deal with the coherent interaction between excitons and opti
cal fields.