Abstract
A few years ago, it was demonstrated that, in a time-resolved four-wave mixing (TFWM) experiment, the ultimate resolution equals the coherence time of the light τc, rather than the pulse duration τL. Therefore, long-duration broadband laser pulses, with τc<τL can be used for the investigation of ultrafast relaxation processes. However, the short-time- resolution property was observed to be mainly effective for the measurement of optical dipole decay rates)dephasing rate). Extension to the measurement of excited-level lifetimes was attempted by several groups,1 but spurious structures often obscure the pertinent component of the signal.
© 1992 Optical Society of America
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