Chirped pulse interferometry for time resolved density and velocity measurements of laser produced plasmas

摘要

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 (10~(17)/cm~3) 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 x 107 cm/s was estimated along with its temporal profile.The details of the method and the results are presented.