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The interaction of powerful laser and X-ray pulses
with planar low average density (0.5–10 mg/cm3)
porous agar-agar targets was experimentally studied. At
a laser power density of ∼5 × 1013
W/cm2 (λ = 1.054 μm) the laser light
absorption and following energy transfer processes, as well
as dynamics of produced plasma were investigated in detail
with a variety of optical and X-ray diagnostic methods. Volume
absorption is shown to occur in experiments with laser-irradiated
agar targets. An extended laser energy deposition region filled
with hot (0.8–1 keV) plasma is formed inside a porous
target. The laser light absorption efficiency is as high as ∼80%.
The emission of 2ω0 and 3ω0/2 harmonics
from laser-produced plasma is observed over the time of the laser pulse
even with agar targets of 0.5 mg/cm3 average density.
Characteristics of energy transfer in low-density porous media are
measured in experiments on illumination of agar targets by laser
pulses or X rays emitted by a thin Cu converter. The hydrodynamic
mechanism is responsible for the energy transfer in laser-illuminated
porous targets and the radiative energy transfer seems to be dominant
in the case of X-ray irradiation. The experimental data are in
reasonable agreement with predictions of a developed theoretical model
describing the hot plasma layer formation and the two-stage homogenization
process within the illuminated porous targets.
Results of experimental and computational investigations devoted to energy transfer mechanisms and X-ray conversion efficiency in laser-produced plasma are presented and discussed. The layers of different thicknesses and diameters deposited on the plane mylar substrate were irradiated by the focused beam of Nd:glass laser. Spectrally, temporally, and spatially resolved measurements of soft X-ray emission have been carried out at power densities of 1013-1014 W/cm2. The conditions of “re-emission” zone formation have been established. Radiative heat conductivity is shown to be the important energy transfer mechanism in the experimental conditions under investigation.
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