COHERENT POPULATION TRAPPING IN MULTILEVEL LASER-INDUCED CONTINUUM STRUCTURE-SYSTEM INCLUDING CASCADE 2-PHOTON PROCESSES

We have investigated the atomic coherent population trapping in a mult ilevel laser-induced continuum structure system including cascade two- photon processes, in which two sets of quasicontinua of excited levels to be modeled as the Biuon-Jortner quasicontinuum are laser-embedded into a previously structureless atomic continuum. The condition leadin g to the atomic coherent population trapping and the coherent populati on trapping state are given explicitly. And the effects of the Fano fa ctors, the laser intensities and the detunings on the amount of popula tion trapped in the atomic bound states and the populations distribute d in the two sets of quasicontinua are also examined.