An ungated inverse time-correlated single-photon counting system is described. The excitation source is a cw-pumped, linear prism-pair-stabilized, passive mode-locked femtosecond dye laser. The excitation pulse repetition rate is 120 MHz. The sample emission is detected with a microchannel plate photomultiplier tube. An iterative least-squares reconvolution method is applied to the data analysis. The fluorescence lifetimes, the reorientation times and the anisotropy factors of the dye solutions cresyl violet perchlorate and rhodamine 101 perchlorate in ethanol are determined.
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