Generation of flat-top focussed beams for percussion drilling of ceramic and metal

Coutts, David W.; Withford, M. J.; Piper, J. A.; Rutterford, G.; Bell, Andrew; Knowles, M. R. H.

doi:10.2351/1.5066135

Cited by 1 publication

(1 citation statement)

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“…Especially, the top-hat laser micro-processing offers important advantages in micro-hole drilling [39], micro-channel scribing [40], and micro-structuring in general. Coutts et al used nanosecond laser with top-hat profile to drill micro-holes on brass and ceramics substrates [41]. Their research has shown a significant improvement in holes' quality, especially in drilling brass plates compared to a conventional Gaussian profile.…”

Section: Application Of Top-hat Beams In Laser Micro-machiningmentioning

confidence: 99%

Effects of Top-hat Laser Beam Processing and Scanning Strategies in Laser Micro-Structuring

Penchev

Henrottin³

et al. 2020

Micromachines

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The uniform energy distribution of top-hat laser beams is a very attractive property that can offer some advantages compared to Gaussian beams. Especially, the desired intensity distribution can be achieved at the laser spot through energy redistribution across the beam spatial profile and, thus, to minimize and even eliminate some inherent shortcomings in laser micro-processing. This paper reports an empirical study that investigates the effects of top-hat beam processing in micro-structuring and compares the results with those obtainable with a conventional Gaussian beam. In particular, a refractive field mapping beam shaper was used to obtain a top-hat profile and the effects of different scanning strategies, pulse energy settings, and accumulated fluence, i.e., hatch and pulse distances, were investigated. In general, the top-hat laser processing led to improvements in surface and structuring quality. Especially, the taper angle was reduced while the surface roughness and edge definition were also improved compared to structures produced with Gaussian beams. A further decrease of the taper angle was achieved by combining hatching with some outlining beam passes. The scanning strategies with only outlining beam passes led to very high ablation rates but in expense of structuring quality. Improvements in surface roughness were obtained with a wide range of pulse energies and pulse and hatch distances when top-hat laser processing was used.

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Section: Application Of Top-hat Beams In Laser Micro-machiningmentioning

confidence: 99%