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Ripple formation during deep hole drilling in copper with ultrashort laser pulses


Cross sections of deep holes produced by ultrashort laser pulses and showing a variety of microstructural formations are presented. After tens of thousands of 800 nm wavelength pulses, the walls of the holes show distinct ripples with a period of ∼300 nm. It is demonstrated that these ripples are the result of light interference effects. Indeed, the ripples are perpendicular to the electric field of the laser beam and their spacing scales with the laser wavelength. Additional fine ripples with spacing of ∼75 nm were also observed.

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Correspondence to A. Weck.

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62.20.Mk; 62.25.+g; 79.20.Ds

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Weck, A., Crawford, T., Wilkinson, D. et al. Ripple formation during deep hole drilling in copper with ultrashort laser pulses. Appl. Phys. A 89, 1001–1003 (2007).

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  • Pulse Length
  • Ultrashort Laser Pulse
  • Scanning Electron Micro Image
  • Deep Hole Drilling
  • Ripple Formation