Abstract
A simple and convenient method to improve the signal-to-noise ratio in single-shot pump-probe experiments with picosecond time resolution is described. The pulse energies, which have to be known very accurately to derive exact data of the photoinduced transmission change in the sample, are measured indirectly via the fluorescence of an appropriate dye-solution. Design criteria for such an indirect energy detection unit are given and experimental results are compared to standard detection schemes. With the described method absorbance changes as low as 10 -3 can be measured routinely.
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