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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Available from: Jan Siegel, Sep 30, 2015
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    • "A dove prism was inserted in the optical path of the image to rotate it 90º; this was done so that the image would expand axially down the spectrograph slit instead of transversely across it. In this way, it was possible to achieve very high spatial resolution for density measurements, and it was possible to estimate the plasma density within several hundred µm of the target [13] "
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    ABSTRACT: We investigated the angular dependence of atomic and ionic debris from CO2 and YAG laser-produced tin plasmas. Several diagnostic techniques were employed for this study including a Faraday cup, witness plates and subsequent x-ray photoelectron spectroscopic analysis, optical emission spectroscopy etc. It was found that the debris emission from the Nd:YAG laser-produced plasmas fell sharply from the target normal. In contrast, the debris emission from the CO2 laser-produced plasmas was almost constant at short angles from the target normal. Our results also indicated that the plasma produced by the CO2 laser emitted less atomic and ionic debris compared to a plasma produced by Nd:YAG laser.
    Proceedings of SPIE - The International Society for Optical Engineering 03/2010; DOI:10.1117/12.848333 · 0.20 Impact Factor
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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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    ABSTRACT: Laser-induced breakdown spectroscopy (LIBS) has been used to determine the lead content of different types of lead silicate glasses commercially designed as sonorous glass (which contain ∼ 10 wt.% PbO); crystal glass (with at least 24 wt.% PbO) and superior crystal glass (with at least 30 wt.% PbO). Seven different types of glass samples were selected, including historic-original, model and commercially available. The selected samples were artificially weathered under neutral, acid and alkaline attack. Analysis by LIBS was carried out in vacuum under excitation at 266 nm and results were compared with those obtained by conventional techniques used for glass characterization. Composition of the bulk glasses was analyzed by XRF (X-ray fluorescence) and the corroded surfaces were characterized by SEM/EDX (scanning electron microscopy/energy dispersive X-ray microanalysis). A linear correlation was obtained between the intensity of selected Pb lines in the LIB spectra and the PbO content. The effect of corrosion could be characterized by comparing successive LIB spectra recorded on the same area; acid attack resulted in a decrease of PbO, CaO and Na2O content in the surface with respect to the bulk of the sample, while minor changes in the composition were noticed under alkaline attack. These results show LIBS as a useful technique to classify the different types of lead glasses by their lead content and to determine and asses the degree and type of corrosion.
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    ABSTRACT: We report on time-resolved spectroscopy of femtosecond laser plasma with the use of ultrafast streak cameras. Laser spark was excited in air, nitrogen, argon or helium by tightly focused Ti: sapphire 130 fs, 1mJ, 800 nm single laser pulses. Maximum laser radiation intensity in the focal point was up to 2.5x1017 W/cm2. The time behavior of laser plasma continuum, tabulated spectral lines as well as the second and third harmonics were observed with pico-femtosecond time resolution. We believe that the second harmonic generation in femtosecond laser spark was recorded for the first time.
    Proceedings of SPIE - The International Society for Optical Engineering 03/2005; DOI:10.1117/12.571805 · 0.20 Impact Factor
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