Time resolved observation of resonant and non-resonant contributions to the nonlinear susceptibility χ(3)

The resonant and nonresonant part of χ(3) are distinguished by
their different time behavior. The medium is coherently excited by
two picosecond light pulses of defined frequency difference and the
state of the system is monitored by a third properly delayed probe
pulse. Results are presented on neat liquids of carbontetrachloride
and cyclohexane and on the mixture of CCl4: C6H12.