Experimental set-up for time dependent transient absorption/gain measure-ments with femtosecond time resolution is presented. The pump-probe spectroscopy tech-nique with femtosecond pulses from Ti: Sapphire laser system (Spectra Physics) allowed measurements of the optical density of transient absorption and transient gain in the spectral range of 330-700 nm, time resolution of 120 fs, and the accuracy of up to 0.005. The real time resolution and "zero time" dispersion of the system were found in two-photon absorption experiment.
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