We report a four-photon resonant nondegenerate eight-wave mixing (NEWM) in a dresses N-type six-level system. It
has advantages that phase match condition is not stringent and NEWM signal is enhanced tremendously due to the
multiple resonance with the atomic transition frequencies. In the prenence of a strong coupling field, the four-photon
resonant NEWM spectrum exhibits Autler-Townes splitting. Compared to two-photon resonant nondegenerate four-wave
mixing and three-photon resonant nondegenerate six-wave mixing in dressed atoms, four-photon resonant NEWM
spectrum is more complicated and can provides information about the relaxation of higher-order atomic coherence.
We study the quantum interference in three-photon resonant nondegenerate six-wave mixing (NSWM) in a five-level
system in which the middle level of six-wave mixing and other level are coupled by a strong laser field. The coupling
field-dependence of the NSWM signal intensity and the spectrum of the NSWM with a coupling field are discussed. We
find that in the presence of a strong coupling field, the three-photon resonant NSWM spectrum exhibits Autler-Townes
splitting, which reflects the levels of the dressed states. It also leads to either suppression or enhancement of the NSWM
signal.
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