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1 In sti tute of Phys ics, Uni ver sity of Bel grade, Bel grade, Ser bia 2 Un ion -Nikola Tesla Uni ver sity, Bel grade, Ser bia 3 As tro nom i cal Ob ser va tory, Bel grade, Ser bia 4 Paris Ob ser va tory, Meudon Cedex, France Sci en tific pa per http://doi.org/10.2298/NTRP1703222SOn the ba sis of cal cu lated val ues for the con duc tiv ity in an ex ter nal elec tric field, we de termined the high-fre quency char ac ter is tics of plas mas un der ex treme con di tions (e. g. dense plasma fo cus de vice). The ex am ined range of fre quen cies cov ers the IR, vis i ble, UV, XUV up to X re gions and the con sid ered elec tronic num ber den sity and tem per a ture are in the ranges of 10 21 cm -3 £ Ne £ 5×10 24 cm -3 and 2×10 4 K £ T £ 10 6 K, re spec tively. The data ob tained us ing this method are im por tant for plasma fo cus re search, lab o ra tory plasma re search, in ves ti gation of at mo sphere plas mas of as tro phys i cal ob jects like white dwarfs with dif fer ent at mospheric com po si tions.Key word: plasma fo cus, plasma, dy namic prop erty, elec tro mag netic ra di a tion V. A. Sre}kovi}, et al.: A Study of High-Fre quency Prop er ties of Plasma and the .