The effect of pulse shape on 3d modelling of laser cleaning fluences

Simon Pleasants*, Deborah M. Kane, Boris S. Luk'yanchuk

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

    1 Citation (Scopus)

    Abstract

    Prior research in the field of laser cleaning has suggested that shorter pulses are preferable to achieve low laser cleaning threshold fluences. These predictions were based mainly on exponential pulse shapes. In the present work the three-dimensional model of laser cleaning developed by Boris Luk'yanchuk (B. S. Luk'yanchuk et al., Appl Phys A, 77, 2, 209) which accounts for near-field focussing, has been used to calculate the laser cleaning threshold fluence for three different pulse shapes. These were rectangular, sinusoidal and exponential. For each pulse shape, the threshold fluence was determined as a function of pulse width (1- 200 ns) and height (1-15 GW/cm2). It was found that the threshold fluence is strongly dependent on the laser pulse shape, particularly for pulses greater than 100 ns in width. The threshold fluence of the rectangular pulse oscillated with a period equal to that of the period of oscillation of the particle on the substrate. In contrast, for both the exponential and sinusoidal pulses, the threshold fluence decreases initially then increases monotonically with pulse length.

    Original languageEnglish
    Title of host publicationPICALO 2004 - 1st Pacific International Conference on Applications of Laser and Optics, Conference Proceedings
    EditorsMilan Brandt, Erol Harvey
    Place of PublicationOrlando, FL
    PublisherLaser Institute of America
    Pages13-16
    Number of pages4
    ISBN (Print)0912035765, 9780912035765
    Publication statusPublished - 2004
    EventPICALO 2004 - 1st Pacific International Conference on Applications of Laser and Optics - Melbourne, VIC, Australia
    Duration: 19 Apr 200421 Apr 2004

    Other

    OtherPICALO 2004 - 1st Pacific International Conference on Applications of Laser and Optics
    Country/TerritoryAustralia
    CityMelbourne, VIC
    Period19/04/0421/04/04

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