Abstract

This paper presents the results for the measurement of neutral atoms and ion density in a Cu plume generated by laser ablation using electrostatic probes and a piezoelectric sensor. A tripled frequency Nd YAG laser (355 nm, 2 kHz, 23 ns, 10 kW) has been used to produce a plasma plume of copper in vacuum atmosphere (10−4 Torr). It will be shown the effect of laser fluence on the relative densities of neutrals and ions departed from target. It was also observed that the ion density increases with laser fluence while neutral atoms remain roughly constant in the range of our experimental conditions. It was measured a drift velocity around 3–7 km/s and translational temperature in the range of 2.5–4.4×104(K).

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