Plasma arising during the interaction of laser radiation with solids

Abstract

Synchronous oscillation with frequencies in y band Hz), regarded as relevant to the information processing such as scene segmentation, has been numerically studied in a neuronal network. I t is found that this synchronous oscillation relates to an intrinsic oscillation of the system in y band and this feature is robust to various configurations of external stimuli and couplings.

Time-space distribution of laser-induced plasma parameters and its influence on emission spectra of the laser plumes

“…It serves as a physical base to the laser-induced breakdown spectroscopy (LIBS), which is nowadays considered to be one of the most promising techniques of material elemental analysis. The process of the laser excitation of the emission spectra includes a complex combination of phenomena accompanying the laser radiation action on a sample [1][2][3]. These are the sample heating and evaporation, movement of the ablation products in the ambient atmosphere, the erosion plume formation, its expansion and interaction with surroundings, generation of shock waves, interaction of the expanding plasma with the laser radiation etc.…”

Generation of Cluster Beams in a Plasma

“…Then a focused pulse laser beam interacts with a metal surface and creates a flux of evaporating atoms that is transformed later into an atomic and cluster beam. This interaction can lead to breakdown if forming electrons will absorb laser radiation, and the threshold laser power of this instability is about 10 7 W/cm 2 [14], if the laser pulse duration is ∼ 10 −6 − 10 −5 s and a size of an irradiated spot is ∼ 10 − 100 µm. The pulse duration is also restricted since forming clusters can be destructed as a result of absorbtion of laser radiation.…”

“…The assumption is used also that the radius of an irradiating spot on the surface exceeds significantly the mean free path of atoms. The data of Table 4 are based on a general character of processes [14,15]. A laser beam heats the surface up to the temperature T sur and creates the pressure p sur of evaporating atoms.…”

Dynamics of plasma expansion in the pulsed laser material interaction

“…By using 10 Hz repetition rate it has been calculated from the experimental data that a maximum injectable ion current up to 2 mA as reported by Vorobev (1993) and Zeldovich & Raizer (1967).…”

“…The thermal energy of the material, however, can be an order of magnitude lower than the energy corresponding to the maximum velocity of the expanding plasma front. A large number of hydrodynamic treatments have been used to analyse the expansion of the heated materials as reported by Kumar (2001) and Vorobev (1993). In figure 3, power emitted per unit volume per unit energy interval P * β ee are in units of αr 2 e n 2 e c is plotted against photon energy ηw.…”