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

Published online by Cambridge University Press:  09 March 2009

M.H. Mahdieh  and
T.A. Hall
M.H. Mahdieh
Affiliation:
Department of Physics, University of Essex, Wivenhoe Park, Colchester, Essex, CO4 3SQ, United Kingdom
T.A. Hall
Affiliation:
Department of Physics, University of Essex, Wivenhoe Park, Colchester, Essex, CO4 3SQ, United Kingdom
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Abstract

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.

Type
Research Article
Information
Laser and Particle Beams , Volume 14 , Issue 2 , June 1996 , pp. 149 - 156
Copyright
Copyright © Cambridge University Press 1996

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References

REFERENCES

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