Abstract
The influence of the state of the target surface on the processes of near-surface
plasma formation is studied in a wide range of wavelengths and laser-radiation pulse
widths. These experiments made it possible to reveal the local character of the initial
ablation of the target surface, caused both by surface defects and by the defects that
appeared at an early stage of the action of the pulsed laser radiation because of the
volume heterogeneity of solids. It is shown that the localness of the breakdown affects
the evolution of the near-surface plasma formation. The differences in the character of
the formation of the near-surface plasma are revealed when short pulses with rapidly
increasing laser-radiation intensity act and when laser pulses with a slowly increasing
leading edge act. It is established that the localness of the breakdown affects the
evolution of the Rayleigh–Taylor hydrodynamic instability of the contact surface
between the target vapor and subsequently the plasma and the gas surrounding the target,
compressed by the leading shock wave.
© 2011 OSA
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