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A Mach-Zehnder interferometer with pulsed nitrogen laser used for electronic density studies in the plasma focus device is described. The light pulse duration of 2 ns enables interferometric meaeurements to be made at any instant during the plasma evolution in n 20 kJ (20 kV) device. -4 numerical method for interferogram proceesing and computation of the electronic density is presented. Some preliminary plasma studies are discuseed.

A multichannel TEA nitrogen laser has been realized for some optical diagnostics. The following methods have been applied on the plasma focus device (PFD): interferometry, schlieren, shadowgraphy and a new combination of the last two. The background of these methods and some qualitative and quantitative results obtained in plasma focus (PF) studies are presented.

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