Sum-frequency conversion of sample emission with short light pulses has been used for time-resolved fluorescence of chromophores in solution. In contrast to traditional fluorescence upconversion techniques where the time resolved fluorescence signal is approximated from 10 to 15 different sum-frequency gated decays distributed across the fluorescence spectrum, sum-frequency cross-correlation frequency resolved optical gating offers the opportunity to determine the electric field of the sample fluorescence as a function of time. Dynamic quantities associated with changes in the sample emission, such as solvent relaxation, can then be obtained directly from the electric field without assumption of a particular spectral line shape.
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