HIGH-PUMP-POWER EFFECTS ON RESONANT NEARLY DEGENERATE 4-WAVE-MIXING SIGNAL FOR HOMOGENEOUSLY AND INHOMOGENEOUSLY BROADENED 2-LEVEL SYSTEMS

The influence of the high-pump-field intensity saturation and dynamic Stark effects on the resonant nearly degenerate four-wave-mixing signa l (omega3 = 2omega1 - omega2) is studied in a frequency space defined by the pump- and probe-field frequencies, omega1 and omega2, respectiv ely. Variable inhomogeneous widths have been considered ranging from e xtremely narrow (homogeneous distribution) to extremely wide. Remarkab le differences between nearly homogeneously broadened systems and extr eme inhomogeneous ones are exhibited. It is shown, for the situation o f homogeneous broadening, that the spectra carried on with fixed probe and fixed pump frequency values have substantial differences in shape . These differences disappear in the situation of extreme inhomogeneou s broadening. Fixed-pump-frequency resonant and fixed-probe-frequency nonresonant spectra are proposed as very convenient tools to yield use ful evidence about the width of the inhomogeneous molecular distributi on.