Results on target ablation and crater formation at low and high laser intensities (at 5 × 109 W/cm2 with Nd:YAG laser in Catania and 3 × 1016 W/cm2 with iodine laser PALS in Prague) are compared. Attention is paid mainly to the crater formation (crater diameter) in dependence on the position of minimum laser-focus spot (maximum laser intensity) with regards to the target surface, at various laser wavelengths and laser energies. Significant asymmetries of these dependencies were found, similarly, as it was reported earlier e.g. for maximum charge-state of ions and X-ray radiations. Surprisingly not a single one, but two minima were observed, independently of the wavelength, the angle of the target irradiation and the target material.
Bibliographical noteFunding Information:
This work was kindly supported by Marie Curie Fellowship (D. M.) and the Grant Agency of the ASCR (Grant IAA 1010405). The support of INFN Fifth Committee is also grateful acknowledged.
Copyright 2006 Elsevier B.V., All rights reserved.
- Focus position
ASJC Scopus subject areas
- Physics and Astronomy(all)