著者

Pawan K. Tiwari G. J. H. Brussaard M. J. v. d. Wiel V. K. Tripathi

出版者

THE PHYSICAL SOCIETY OF JAPAN

雑誌

Journal of the Physical Society of Japan (ISSN:00319015)

巻号頁・発行日

vol.74, no.8, pp.2255-2259, 2005-08-15 (Released:2008-01-24)

参考文献数

23

被引用文献数

1

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An indigenously built Ti:sapphire laser system delivering 50 mJ, 100 fs pulses at a repetition rate of 10 Hz, is employed to tunnel ionize air at 1 atm pressure and form a plasma channel. The laser is line focused using a cylindrical lens to a spot size of 20μm×1mm. A folded wave interferometry is used to deduce the radial electron density profile by measuring the phase shift and employing Abel inversion. The maximum value of chord-integrated electron density and radial electron density are estimated to be approximately equal to 3.0×1016 cm−2 and 4.0×1018 cm−3 respectively with density scale length of 20 μm. These results have been theoretically interpreted by developing a unified formalism of tunnel ionization. The experimental results are in reasonable agreement with the theory.