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Studies Of Craters' Dimension For Long-pulse Laser Ablation Of Metal Targets At Various Experimental Conditions

机译:不同实验条件下金属靶长脉冲激光烧蚀的弹坑尺寸研究

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Long pulse laser shots of the PALS iodine laser in Prague have been used to obtain metal target ablation at various experimental conditions. Attention is paid mainly to the dependencies of the crater diameter on the position of minimum laser-focus spot with regard to the target surface, by using different laser wavelengths and laser energies. Not only a single one, but two minima, independently of the wavelength, of the target irradiation angle and of the target material, were recorded. Significant asymmetries, ascribed to the non-linear effects of intense laser beam with pre-formed plasma, were found, too. Estimations of ejected mass per laser pulse are reported and used to calculate the efficiency of laser-driven loading. Results on metal target ablation and crater formation at high intensities (from 2 × 10~(13) to 3 × 10~(16) W/cm~2) are presented and compared. Crater depth, crater diameter and etching yield are reported versus the laser energy, in order to evaluate the ablation threshold fluence.
机译:布拉格的PALS碘激光器的长脉冲激光照已用于在各种实验条件下获得金属靶材的烧蚀。通过使用不同的激光波长和激光能量,主要关注陨石坑直径对最小激光聚焦点相对于目标表面的位置的依赖性。不仅记录了目标辐照角度和目标材料的一个最小值,而且记录了两个最小值,与波长无关。还发现了明显的不对称性,归因于强激光束与预先形成的等离子体的非线性效应。报告每个激光脉冲射出质量的估计值,并将其用于计算激光驱动负载的效率。给出并比较了在高强度(从2×10〜(13)到3×10〜(16)W / cm〜2)下金属靶材的烧蚀和弹坑形成的结果。报告了火山口深度,火山口直径和蚀刻产量与激光能量的关系,以评估烧蚀阈值通量。

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