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  • Influence of pulse width on the laser ablation of zinc in nitrogen ambient

    Author(s)
    Nadarajan Achary, Smijesh
    Hemantha Rao, Kavya
    Philip, Reji
    Griffith University Author(s)
    Nadarajan Achary, Smijesh
    Hemantha Rao, Kavya
    Year published
    2016
    Metadata
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    Abstract
    Time-resolved spectroscopic measurements of expanding plasma plumes generated by irradiating a solid zinc target with laser pulses of 7 ns and 100 fs durations are carried out in the ambient pressure range of 0.05–200 Torr of nitrogen. At the relatively high input fluence of ~16 J/cm2, fast and slow atomic species are found to appear at different times in the optical time-of-flight (OTOF) spectra, the dynamics of which is primarily determined by the pulse duration of the excitation laser. In fs LPP, the average speed of fast species is unaffected by an increase in ambient pressure, while in ns LPP, the speed is found to ...
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    Time-resolved spectroscopic measurements of expanding plasma plumes generated by irradiating a solid zinc target with laser pulses of 7 ns and 100 fs durations are carried out in the ambient pressure range of 0.05–200 Torr of nitrogen. At the relatively high input fluence of ~16 J/cm2, fast and slow atomic species are found to appear at different times in the optical time-of-flight (OTOF) spectra, the dynamics of which is primarily determined by the pulse duration of the excitation laser. In fs LPP, the average speed of fast species is unaffected by an increase in ambient pressure, while in ns LPP, the speed is found to reduce with pressure. The slow species shows a sharp peak in the OTOF spectra with a narrow velocity distribution for fs LPP, indicating a large number density and low electron temperature, which is consistent with optical emission spectroscopic (OES) studies. On the other hand, for ns LPP, the OTOF of slow species shows a more broadened profile which can be attributed to strong plume–laser interaction. The dynamics of slow species is heavily influenced by the presence of shock waves, which leads to the occurrence of much slower species at larger pressures.
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    Journal Title
    Applied Physics A
    Volume
    122
    Issue
    460
    DOI
    https://doi.org/10.1007/s00339-016-9972-3
    Subject
    Condensed matter physics
    Condensed matter physics not elsewhere classified
    Atomic, molecular and optical physics
    Materials engineering
    Publication URI
    http://hdl.handle.net/10072/99778
    Collection
    • Journal articles

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