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

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5 Author(s)
Prasad, Y.B.S.R. ; Laser Plasma Division, Raja Ramanna Centre for Advanced Technology, Indore 452013, India ; Barnwal, S. ; Naik, P.A. ; Chakera, J.A.
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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.

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Journal of Applied Physics  (Volume:110 ,  Issue: 2 )