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Electromagnetically induced transparency based six-wave mixing in a Doppler-broadened folded four-level system |
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| Authors: | Niu Jin-Yan Pei Li-Y Wu Ling-An and Fu Pan-Ming |
| Institution: | Laboratory of Optical Physics, Institute of Physics and Center for Condensed Matter, Chinese Academy of Sciences, Beijing 100190, China;Laboratory of Optical Physics, Institute of Physics and Center for Condensed Matter, Chinese Academy of Sciences, Beijing 100190, China;Laboratory of Optical Physics, Institute of Physics and Center for Condensed Matter, Chinese Academy of Sciences, Beijing 100190, China;Laboratory of Optical Physics, Institute of Physics and Center for Condensed Matter, Chinese Academy of Sciences, Beijing 100190, China |
| 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. |
| Keywords: | six-wave mixing electromagnetically induced transparency polarisation interference |
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