Electromagnetically induced transparency based six-wave mixing in a Doppler-broadened folded four-level system

Abstract

We study phase-conjugate six-wave mixing spectroscopy based on electromagnetically-induced-transparency in a Doppler-broadened folded four-level system. It is found that the six-wave mixing spectrum can be either Doppler-free or very broad, depending on whether the interference between the polarisations of atoms with different velocities is constructive or destructive. To obtain the Doppler-free six-wave mixing spectrum in the folded four-level system, the conditions are more stringent in comparison with those in the cascade and N -type four-level systems. This polarisation interference can be controlled in the presence of a strong coupling field.

Electromagnetically induced transparency and quadripartite macroscopic entanglement generated in a ring cavity

“…On the other hand, electromagnetically induced transparency (EIT), as one of the most important coherent effects, has been widely researched both in theory [20][21][22][23][24][25] and experiments. [26] EIT has significant applications in the storage of light.…”

Electromagnetically induced transparency of single Λ-type three-level atoms in a high-finesse optical cavity

“…[2] A large amount of literature on EIT now exists. [3][4][5][6][7][8][9] In addition, its wide applications, such as enhanced optical nonlinearity, [3,4] information storage, [5,6] and achieving an ultraslow group velocity of light, [7] have attracted considerable attention.…”