Journal
APPLIED PHYSICS LETTERS
Volume 93, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3026533
Keywords
Langmuir probes; laser ablation; plasma electromagnetic wave propagation; plasma production by laser; plasma transport processes
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We investigated the process of ultrafast laser ablation of metallic targets induced by a pair of identical laser pulses, with either p or s polarizations, temporally delayed from approximate to 1 ps to a few nanoseconds. We used fast ion probe diagnostics to characterize the ion plume at the moderate laser intensity (approximate to 10(12) W/cm(2)) typically employed in ultrafast laser deposition and material processing. We observed a consistent time-correlated enhancement of the ion yield and velocity, which lends itself to an interesting and useful method for manipulating ablation plasma characteristics. The mechanisms producing this feature are also discussed.
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