CIOP 05384
CENTRO DE INVESTIGACIONES OPTICAS
Unidad Ejecutora - UE
artículos
Título:
Real Time Measurement of the Electron Density of a Laser Generated Plasma Using a RC Circuit
Autor/es:
F. BREDICE, H. SOBRAL, M. VILLAGRáN MUñIZ, H. O. DI ROCCO, G. CRISTOFORETTI, S. LEGNAIOLI, V. PALLESCHI, A. SALVETTI AND E. TOGNONI.
Revista:
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Editorial:
Elsevier
Referencias:
Año: 2007
ISSN:
0584-8547
Resumen:
Abstract: A Nd:YAG laser was focused, in air or on a Cu target, between the plates of a planar charged
capacitor. The plasma generates a temporal redistribution of the electrical charges on the plates that can be
easily measured as a voltage drop across a resistor connected to the ground plate. At the same time, the
Stark broadening of the Há spectral line (656.3 nm) obtained from the optical emission spectrum of the
plasma was measured. In this work, we show that the electrical signal measured on the resistor is, in the
energy range of our laser (30mJ to 220 mJ) and at time delays typical of Laser-Induced Breakdown
Spectroscopy applications (500-5000 ns), linearly related with the Stark broadening of the Há line.
Therefore, after a proper calibration, the electrical signal can be used to determine the electron density of
the generated plasma.á spectral line (656.3 nm) obtained from the optical emission spectrum of the
plasma was measured. In this work, we show that the electrical signal measured on the resistor is, in the
energy range of our laser (30mJ to 220 mJ) and at time delays typical of Laser-Induced Breakdown
Spectroscopy applications (500-5000 ns), linearly related with the Stark broadening of the Há line.
Therefore, after a proper calibration, the electrical signal can be used to determine the electron density of
the generated plasma.á line.
Therefore, after a proper calibration, the electrical signal can be used to determine the electron density of
the generated plasma.
