Improved Characteristics of Laser Source of Ions Using a Frequency Mode Laser

We used a mass‐spectrometric method to investigate the characteristics of laser‐produced plasma ions depending on the nature of the target and on the parameters of the laser radiation. Experiments are carried out on porous Y2O3 targets with different densities ρ, subjected to a laser radiation, where the laser works in a frequency mode (v = l–12 Hz). We found that the laser frequency has a significant effect on the parameters of plasma ions: with increasing the frequency of the laser the charge, energy and intensity of ions increase for a given parameters of the target. This effect is more pronounced for small densities of the target. We related these two effects to a non‐linear ionization process in the plasma due to the formation of dense plasma volume inside the sample absorbing the laser radiation and to the change of the focusing conditions in the case of the frequency mode laser.

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