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Plasma characterization with terahertz time-domain measurements

Jamison, S.P. and Shen, J.L. and Jones, D.R. and Issac, R.C. and Ersfeld, B. and Clark, D. and Jaroszynski, D.A. (2003) Plasma characterization with terahertz time-domain measurements. Journal of Applied Physics, 93 (7). pp. 4334-4336. ISSN 0021-8979

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Abstract

Terahertz time-domain spectral techniques are applied to the characterization of a He discharge plasma. Electro-optically sampling of the electric field of a quasi-unipolar terahertz pulse transmitted through the plasma has allowed both the real and imaginary parts of the plasma permittivity to be simultaneously measured over a large spectral range. The plasma density and the collisional frequency are determined within a 30 ps duration measurement window. An anomalously high collisional frequency has been measured.