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Angular distributions of ions emitted from laser plasma produced at various irradiation angles and laser intensities

  • L. Láska (a1), K. Jungwirth (a1), J. Krása (a1), E. Krouský (a1), M. Pfeifer (a1), K. Rohlena (a1), A. Velyhan (a1), J. Ullschmied (a2), S. Gammino (a3), L. Torrisi (a3), J. Badziak (a4), P. Parys (a4), M. Rosinski (a4), L. Ryć (a4) and J. Wolowski (a4)...

Abstract

Angular distributions of currents and velocities (energies) of ions produced at various target irradiation angles and laser intensities ranged from 1010 W/cm2 to 1017 W/cm2 were analyzed. It was confirmed that for low laser intensities the ion current distributions are always peaked along the target normal. However, at laser intensities comparable to or higher than 1014 W/cm2, the preferred direction of ion emission strongly depends on the irradiation geometry (laser focus setting, the irradiation angle), and can be off the target normal. This is very likely caused by the non-linear interaction of the laser beam with produced plasma, in particular, by the action of ponderomotive forces and the laser beam self-focusing.

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Corresponding author

Address correspondence and reprint request to: L. Láska, Institute of Physics, ASCR v.v.i., Na Slovance 2, 182 21 Prague 8, Czech Republic. E-mail: laska@fzu.cz

References

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