Anomalous absorption of linearly polarized laser pulse in overdense plasma

Tatsufumi Nakamura; Susumu Kato; Toshikazu Kato

doi:10.1117/12.425614

23 April 2001 Anomalous absorption of linearly polarized laser pulse in overdense plasma

Tatsufumi Nakamura, Susumu Kato, Toshikazu Kato

Proceedings Volume 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter; (2001) https://doi.org/10.1117/12.425614
Event: 26th European Conference on Laser Interaction with Matter (ECLIM 2000), 2000, Prague, Czech Republic

Abstract

Anomalous absorption of an intense short laser pulse in overdense plasmas is analyzed. A diffusion equation describing the time evolution of the electron distribution function is derived. From the equation it is shown that the electron distribution function becomes anisotropic in the momentum space, which gives rise to the absorption of the energy. The diffusion is dominant in p_x direction rather than p_z direction. In p_z direction, however, the drift term is contained resulting for the longitudinal component of the J X B force, which has ben neglected but is important for the intense laser case. The absorption coefficient and skin depth is obtained for the ASE regime. The absorption coefficient increases in time starting from the well-known absorption coefficient for a lower intensity laser pulse.

Citation Download Citation

Tatsufumi Nakamura, Susumu Kato, and Toshikazu Kato "Anomalous absorption of linearly polarized laser pulse in overdense plasma", Proc. SPIE 4424, ECLIM 2000: 26th European Conference on Laser Interaction with Matter, (23 April 2001); https://doi.org/10.1117/12.425614

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