Temporally and spectrally resolved imaging of laser-induced plasmas

Laser Processing Group, Instituto de Optica, Consejo Superior de Investigaciones Cientificas, Serrano 121, 28006 Madrid, Spain.
Optics Letters (Impact Factor: 3.29). 11/2004; 29(19):2228-30. DOI: 10.1364/OL.29.002228
Source: PubMed


We report a hybrid imaging technique capable of performing measurements of the spatial, temporal, and spectral emission characteristics of laser-induced plasmas by use of a single detection system. We apply this technique to study the plasma produced by laser ablation of LiNbO3 and observe phenomena not seen in such detail with standard instruments. These include extreme line broadening up to a few nanometers accompanied by self-absorption near the target surface, and expansion dynamics that differ strongly between the different species. Overall, the wealth of quantitative information provided by this novel technique sheds new light on processes occurring during plasma expansion.

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    • "Despite the high fluences used the dimensions of the crater created after a single laser pulse did not exceed around 300 μm. The samples were located inside a vacuum chamber evacuated down to 0.2 mbar and the plasma emission was collected at right angles by means of two quartz lenses ( f 1 = 4 cm, f 2 = 10 cm) and a periscope inserted between the lenses [29]. These conditions were required to carry out a general study on the spatial and temporal evolution of the ablation plasma plume. "
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