Scientific Results

Characterization of a collinear double pulse laser-induced plasma at several ambient gas pressures by spectrally- and time-resolved imaging

Year: 2005

Authors: Cristoforetti G., Legnaioli S., Palleschi V., Salvetti A., Tognoni E.

Autors Affiliation: CNR – IPCF, Via Moruzzi 1, I-56124 Pisa, Italy.

Abstract: A collinear double pulse laser-induced plasma was characterised by means of a spectrally and time resolved imaging technique. The beams of two Q-switched Nd: YAG lasers were focused on a brass target in a vacuum chamber to form the plasma. The plume emission intensity and spatial distribution were recorded with temporal resolution using an intensified CCD. Using a set of interference filters, we collected images of the emission from the major target components as well as from oxygen. Both the laser inter-pulse separation ( in the range between 0 and 10 mu s) and the ambient air pressure value ( in the range between 10(5) and 10 Pa) were varied during the experiment. At atmospheric pressure, an enhancement of the line emission from the target elements was observed for delayed laser pulses compared to coincident pulses. However, this enhancement effect tends to fall at low pressure values, and a decrease of the signal is observed for pressures under about 10(4) Pa. Moreover, it was observed that the evaluation of the enhancement factor strongly depends on the detector field of view. The propagation of the emitting plume was also studied at several pressures and inter-pulse delays.

Journal/Review: APPLIED PHYSICS B-LASERS AND OPTICS

Volume: 80 (4-5)      Pages from: 559  to: 568

KeyWords: INDUCED BREAKDOWN SPECTROSCOPY; Duple pulse; SAMPLES; CONFIGURATION; MICROANALYSIS; ABLATION; EMISSION; SINGLE
DOI: 10.1007/s00340-005-1758-9

Citations: 66
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