Strong grating wave effects in degenerate four-wave mixing

摘要

Resonant backward degenerate four-wave mixing in a $Lambda@-type Doppler-broadened 3- level system using two arbitrarily intense copropagating and crosspolarized pump beams is analyzed. The saturation features of the emission spectra are shown to depend critically on the pump imbalance and in case of a balanced grating wave saturation level-crossing emission resonances arising from destructive interference effects between coherent excitation pathways are shown to appear.