Abstract
We make an extensive theoretical study of the field-correlation effects on Rayleigh-type nondegenerate four-wave mixing (NFWM), which have been employed for the measurement of ultrafast longitudinal time in the frequency-domain recently (Phys. Rev. Lett. 88 (2002) 113902). The principle of field-correlation is then applied to the thermal background suppression in an absorbing medium. Conditions, under which contributions from the thermal grating can be neglected, are given and numerical results, which illustrate the validity of this method, are presented. The temporal asymmetry in Rayleigh-type NFWM spectrum has also been investigated.
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