Laser-assisted generation of self-assembled microstructures on stainless steel

Robert Lloyd, Amin Abdolvand, Marc Schmidt, Philip Crouse, David Whitehead, Zhu Liu, Lin Li

    Research output: Contribution to journalArticlepeer-review

    33 Citations (Scopus)


    Utilising a Nd:YVO4 laser (wavelength of 532 nm, pulse duration of 8 ns, repetition rate of 30 kHz) and a Nd: YAG laser ( wavelength of 1064 nm, pulse duration of 7 ns, repetition rate of 25 kHz), it was found that during the pulsed laser ablation of metal targets, such as stainless steel, periodic nodular microstructures (microcones) with average periods ranging from similar to 30 to similar to 50 mu m were formed. This period depends on the number of accumulated laser pulses and is independent of the laser wavelength. It was found that the formation of microcones could occur after as little as 1500 pulses/spot ( a lower number than previously reported) are fired onto a target surface location at laser fluence of similar to 12 J/cm(2), intensity of similar to 1.5 GW/cm(2). The initial feedback mechanism required for the formation of structures is attributed to the hydrodynamic instabilities of the melt. In addition to this, it has been shown that the structures grow along the optical axis of the incoming laser radiation. We demonstrate that highly regular structures can be produced at various angles, something not satisfactorily presented on metallic surfaces previously. The affecting factors such as incident angle of the laser beam and the structures that can be formed when varying the manner in which the laser beam is scanned over the target surface have also been investigated.

    Original languageEnglish
    Pages (from-to)117-122
    Number of pages6
    JournalApplied Physics A: Materials Science & Processing
    Issue number1
    Publication statusPublished - 2008


    Dive into the research topics of 'Laser-assisted generation of self-assembled microstructures on stainless steel'. Together they form a unique fingerprint.

    Cite this