Dr. Geoff Martin Profile

Dr. Geoff Martin

Physicist at Raptor Photonics Ltd

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Proceedings Article | 26 May 1998 Paper

Mapping neutral, ion, and electron number densities within laser-ablated plasma plumes

I. Weaver, Liam Doyle, G. Martin, Dave Riley, M. Lamb, William Graham, Tom Morrow, Ciaran Lewis

Proceedings Volume 3404, (1998) https://doi.org/10.1117/12.308637

KEYWORDS: Ions, Plasma, Laser beam diagnostics, Dye lasers, Laser induced fluorescence, Magnesium, Laser ablation, Absorption, Copper, Fluorescence spectroscopy

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Spatially and temporally varying neutral, ion and electron number densities have been mapped out within laser ablated plasma plumes expanding into vacuum. Ablation of a magnesium target was performed using a KrF laser, 30 ns pulse duration and 248 nm wavelength. During the initial stage of plasma expansion (t <EQ 100 ns) interferometry has been used to obtain line averaged electron number densities, for laser power densities on target in the range 1.3 - 3.0 X 10⁸ W/cm². Later in the plasma expansion (t equals 1 microsecond(s) ) simultaneous absorption and laser induced fluorescence spectroscopy has been used to determine 3D neutral and ion number densities, for a power density equal to 6.7 X 10⁷ W/cm². Two distinct regions within the plume were identified. One is a fast component (approximately 10⁶ cm^-1) consisting of ions and neutrals with maximum number densities observed to be approximately 30 and 4 X 10¹² cm^-3 respectively, and the second consists of slow moving neutral material at a number density of up to 10¹⁵ cm^-3. Additionally a Langmuir probe has been used to obtain ion and electron number densities at very late times in the plasma expansion (1 microsecond(s) <EQ t <EQ 15 microsecond(s) ). A copper target was ablated using a Nd:YAG laser, 7.5 ns duration and 532 nm (2 (omega) ) wavelength, with a power density on target equal to 6 X 10⁸ W/cm². Two regions within the plume with different velocities were observed. Within a fast component (approximately 3 X 10⁶ cms^-1) electron and ion number densities of the order 5 X 10¹² cm^-3 were observed and within the second slower component (approximately 10⁶ cms^-1) electron and ion number densities of the order 1 - 2 X 10¹³ cm^-3 were determined.

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