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Study of laser-driven shock wave propagation in Plexiglas targets

Published online by Cambridge University Press:  09 March 2009

L. J. Dhareshwar ,
P. A. Naik ,
T. C. Kaushik  and
H. C. Pant
L. J. Dhareshwar
Affiliation:
Laser Division, Bhabha Atomic Research Centre, Bombay-400085, India
P. A. Naik
Affiliation:
Laser Division, Bhabha Atomic Research Centre, Bombay-400085, India
T. C. Kaushik
Affiliation:
Neutron Physics Division, Bhabha Atomic Research Centre, Bombay-400085, India
H. C. Pant
Affiliation:
Laser Division, Bhabha Atomic Research Centre, Bombay-400085, India
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Abstract

An experimental study of laser-driven shock wave propagation in a transparent material such as Plexiglas using a high-speed optical shadowgraphy technique is presented in this paper. A Nd:glass laser was used to produce laser intensity in the range 1012-1014 W/cm2 on the target. Optical shadowgrams of the propagating shock front were recorded with a second-harmonic (0.53-μm) optical probe beam. Shock pressures were measured at various laser intensities, and the scaling was found to agree with the theoretically predicted value. Shock pressure values have also been obtained from a one-dimensional Lagrangian hydrodynamic simulation, and they match well with experimental results. Shadowgrams of shock fronts produced by nonuniform spatial laser beam irradiation profiles have shown complete smoothing when targets with a thin coating of a material of high atomic number such as gold were used. Shock pressures in such coated targets are also found to be considerably higher compared with those in uncoated targets.

Type
Research Article
Information
Laser and Particle Beams , Volume 10 , Issue 1 , March 1992 , pp. 201 - 211
Copyright
Copyright © Cambridge University Press 1992

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