Using time-resolved pump-probe system based on nonlinear image technique with phase object, we determine the
rotational lifetime of toluene with 19-ps laser pulse at 532 nm. The system can be applied to both degenerate and
non-degenerate beams in any polarization states. The proposed method is advantageous and imposes a lower stress
in the cases of fragile materials, since a single shot of laser pulse is enough for the definition of their nonlinear
refractive indices and absorption coefficients. Advantages of this scheme are relative ease of producing the steady
probe beam with top-hat profile. The coupling theory of the pump beam and the probe beam in perpendicular linear
polarizations states is used to interpret the experimental results. With the help of coupling equations we numerically
fitted our experimental results. Good agreement is obtained between the theory and the experiment. Additionally, we
derive the rotational lifetime of toluene τrot=4.8 ps with the help of theoretical fit.
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