作者: S. Amoruso , R. Bruzzese , X. Wang , G. O’Connell , J. G. Lunney
DOI: 10.1063/1.3516491
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摘要: Copper targets are irradiated in the ablation regime by pairs of equal, time-delayed collinear laser pulses separated on a timescale going from ≈2 ps to ns. The plume is characterized ion probe diagnostic, fast imaging, and temporally spatially resolved optical emission spectroscopy. variation efficiency with delay between analyzed measuring crater profile contact profilometer. second pulse modifies characteristics plasma produced first efficiency. different mechanisms involved double ultrafast identified discussed. experimental findings interpreted frame simple model interaction nascent pulse. This yields consistent quantitative agreement predicting observed trends depth reduction yield increase pulses, as well characteristic changes. possibility controlling plumes during via an efficient coupling energy various components particular interest pulsed deposition microprobe analyses materials.