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

• 来源期刊: 中国物理B（英文版）
• 关键词: six-wave mixing electromagnetically induced transparency polarisation interference
• 年，卷（期）: 2010,（11）
• 页码范围: 311-317
• 页数: 7页
• 语种: 英文

摘要

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.