, Volume 76, Issue 3, pp 319-323

Time-resolved spectroscopy measurements of a titanium plasma induced by nanosecond and femtosecond lasers

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Abstract.

We have studied the plasma induced at the surface of a titanium target following irradiation with femtosecond and nanosecond laser pulses. Time-resolved imaging and spectroscopic measurements allowed us to evidence some features specific to the femtosecond-laser-induced plasma. In this ultrashort interaction regime, we could discriminate between three different velocity populations in the plasma expansion. Coulomb explosion firstly creates highly energetic Ti+ ions, which are followed by atomic neutral titanium and lastly by nanoscale titanium oxide clusters.

Received: 28 September 2001 / Accepted: 9 July 2002 / Published online: 25 October 2002
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ID="*"Corresponding author. Fax: +33-1/6931-9996, E-mail: albert@ensta.fr