Abstract
Laser-ablation laser-induced breakdown spectroscopy (LA-LIBS) based on single
Nd:YAG laser is used to analyze copper impurity in silver jewellery with enhanced
sensitivity and minimal sample ablation. 6-30 folds signal enhancement can be
achieved under the re-excitation of the breakdown laser and the spatial resolution
is only determined by the ablation laser. 50 ppm limit of detection of copper is
achieved when the crater diameter is 17.2 μm under current experimental
condition. This technique gives higher analysis sensitivity under the same sample
ablation in comparison with single pulse (SP) LIBS. It is useful for high sensitive
element microanalysis of precious samples.
© 2014 Chinese Optics Letters
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