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Optical emissivity from a laser-driven shock-heated dense plasma

  • M.H. Mahdieh (a1) and T.A. Hall (a1)

The aluminium side of two-layer Al-Plastic targets were irradiated with a long pulse (∼ 2.4 ns FWHM) 1.06-μm laser light at intensities up to 7 × 1013 W/cm2. The time history of the thermal emission of the confined rear surface of the aluminum was measured. Visible emission only occurs for a short time after the arrival of the laser-generated shock waves. Over the range of the measurements, the duration and the intensity of the emission reduce with increasing laser intensity. The experimental results are in good agreement with the results of a simple phenomenological model that assumes a linear temperature and density profile on the shock front. The values of shock velocity and maximum temperature and density that were used in the model were found using the hydrodynamic simulation code MEDUSA. From the model the shock width was measured for different conditions by matching the emission of the experiment and model. It is found that the time history of the emission is strongly sensitive to the ionization potential of the plastic that is assumed to change with density from ∼ 4 eV at zero pressure to zero at high densities. The technique provides a way to measure the pressure metallization of large band gap insulators.

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Asaumi, K. et al. 1982 Phys. Rev. Lett. 49, 837.
Billon, D. et al. 1975 Opt. Comm. 15, 108.
Burnett, N.H. et al. 1981 Appl. Phys. Lett. 38, 226.
Cottet, F. et al. 1984 Phys. Rev. Lett. 52, 1884.
Godwal, B.K. et al. 1983 Phys. Reports 102, 122.
Gold, S.H. & McLean, E.A. 1982 J. Appl. Phys. 53, 784.
Goldtone, P.D. et al. 1981 Appl. Phys. Lett. 38, 223.
Hall, T.A. & Hamidi, S. 1994 Nuovo Cimento 16D, 561.
Huller, S. et al. 1994 GSI-94 Annual Report.
Kidder, R.E. 1968 Nucl. Fusion 8, 3.
Makarenko, I.N. et al. 1984 Phys. Rev. B. 29, 6018.
McLean, E.A. et al. 1980 Phys. Rev. Lett. 45, 1246.
Mead, C.W. et al. 1981 Phys. Rev. Lett. 47, 1289.
Mead, C.W. et al. 1983 Phys. Fluids 26, 2316.
More, R.M. 1981 Laser Interaction and Related Plasma Phenomena, Vol. 5, Schwarz, H.J. et al. , eds. (Plenum Publishing Company, New York), p. 253.
More, R.M. 1991 Handbook of Plasma Physics, Vol. 3, Rosenbluth, M.N. and Sagdeev, R.Z., eds. (Elsevier, New York), p. 63.
Ng, A. et al. 1985a Optics Comm. 53, 389.
Ng, A. et al. 1985b Phys. Fluids 28, 2915.
Ng, A. et al. 1986a Optics Comm. 56, 425.
Ng, A. et al. 1986b, Phys. Rev. Lett. 57, 1595.
Nishimura, H. et al. 1981 Appl. Phys. Lett. 39, 592.
Obsenchain, S.P. et al. 1983 Phys. Rev. Lett. 50, 44.
Rodgers, P.A. et al. 1989 MED103: A laser-plasma simulation code.
Salzman, D.H. et al. 1987 Phys. Fluids 30, 515.
Trainor, R.J. et al. 1979 Phys. Rev. Lett. 42, 1154.
Van Kessel, C.G.M. & Sigel, R. 1974 Phys. Rev. Lett. 33, 1020.
Van Kessel, C.G.M. 1975 Z. Naturf. 30, 1581.
Veeser, L. & Solem, J. 1978 Phys. Rev. Lett. 40, 1391.
Veeser, L. et al. 1979 Appl. Phys. Lett. 35, 761.
Zel'dovich, Ya.B. & Raizer, Yu.P. 1966 Physics of Shock Waves and High Temperature Hydrodynamic Phenomena, Vol. II (Academic Press, New York).
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Laser and Particle Beams
  • ISSN: 0263-0346
  • EISSN: 1469-803X
  • URL: /core/journals/laser-and-particle-beams
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