Influence of distances between the lens and the target on the characteristic of laser induced lead plasma
College of Physics and Electronics, Shandong Normal
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Received in final form: 28 October 2010
Published online: 9 June 2011
The influence of distances between the lens and a pure lead target on the breakdown spectroscopy of plasmas induced by a Nd:YAG laser ablation was studied at atmospheric pressure. The electron density, the electron temperature and the self-absorption were analysed when the distances were less than the focal length (6.5 cm). The maximal electron density presented at the point 5.8 cm. Moreover, the self-absorption can be observed in all of the wave ranges when the distances are more than the focal length. This phenomenon can be understood by the air breakdown.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011