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Hydrodynamics of plasma and shock waves generated by the high-power GARPUN KrF laser

Published online by Cambridge University Press:  01 March 2004

V.D. ZVORYKIN ,
V.G. BAKAEV ,
I.G. LEBO  and
G.V. SYCHUGOV
V.D. ZVORYKIN
Affiliation:
P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
V.G. BAKAEV
Affiliation:
P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
I.G. LEBO
Affiliation:
Moscow Institute of Radioengineering, Electronics and Automation (Technical University), Moscow, Russia
G.V. SYCHUGOV
Affiliation:
P.N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
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Abstract

The electron-beam-pumped KrF laser installation GARPUN with a 100-J output energy and long 100-ns pulse duration has been used to investigate laser–target interactions in a broad range of laser intensities for small (150 μm) and large (∼1 cm) irradiated spots. For higher intensities (up to 5 × 1012 W/cm2), a conical shock wave was generated in condensed matter by megabar pressure at the ablation front. It propagated with a supersonic velocity in a quasisteady manner together with a conical shock wave inside a target. Evaporated target material moving with a velocity of ∼50 km/s formed an extended plasma corona of ∼5 mm length with an electron temperature of ∼100 eV. Emission spectra of plasma have been investigated in the extreme UV range 120–250 Å. For lower intensities (108–109 W/cm2), planar shock waves in normal density air were produced with initial velocities up to 4 km/s in the forward direction and 7 km/s in the opposite direction toward incident radiation. In rarefied air, the forward shock wave kept velocities constant whereas the backward ones were accelerated up to 30 km/s. Planar compression waves in transparent condensed matter were also demonstrated propagating with sonic velocity.

Keywords

High-power KrF laser–target interactionPlanar and conical shock waves in condensed matterPlanar hypersonic shock waves in gases
Type
International Conference on the Frontiers of Plasma Physics and Technology
Information
Laser and Particle Beams , Volume 22 , Issue 1 , March 2004 , pp. 51 - 57
Copyright
2004 Cambridge University Press

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