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An optical diagnostic method to record the evolution of plasma density on picosecond time scale with ∼8 ps resolution in a single shot is presented. A chirped laser pulse of 200 ps is used for obtaining the time resolved interferograms to provide the temporal evolution of plasma density (1017/cm3) during the probe beam duration. It is shown that the plasma expansion velocity can also be measured from the diffraction pattern superimposed on the interferograms. Plasma velocity of ∼1.2 × 107 cm/s was estimated along with its temporal profile. The details of the method and the results are presented.