Saturation in degenerate four wave mixing: The dressed-atom approach

A dressed atom approach of saturation in degenerate four-wave mixing is presented. Because of the Doppler-shift of the pump and probes waves frequencies, a resonance between levels of the dressed atom occurs for two velocity groups. When the Rabi frequency Ω₁ is smaller than the Doppler width ku, these resonant terms give the essential contribution to the signal which is analytically calculated. When Ω₁ å ku, the signal is expected to be much smaller.