STUDY AND CHARACTERIZATION OF THE 4-WAVE-MIXING SIGNAL IN THE FREQUENCY SPACE

The characteristics and properties of a resonant nearly degenerate fou r-wave mixing signal are studied in the frequency space defined by the pump- and probe-field frequencies. Simultaneous effects of the intens e pump field (perturbative treatment at all orders in the amplitude of the total field), chemical concentration of the solution, inhomogeneo us distribution of resonance frequencies, and propagation of the elect romagnetic fields are studied. Discussion and interpretation of the re sults are based on different characteristics of the non-linear signal within the absorptive and saturative regime, and on the behaviour in t he frequency space of the component of the propagation-vector mismatch . Results obtained in this model are compared to previous spectral hom ogeneous-line results and to local cases.