Investigation of an interlaced laser beam scanning method for ultrashort pulse laser micromachining applications

Krystian Lukasz Wlodarczyk, Joerg Schille, Lucas Naumann, Amiel Lopes, Ioannis Bitharas, Prveen Bidare, Stephen Dondieu, Paul Blair, Udo Loeschner, Andrew J. Moore, M. Mercedes Maroto-Valer, Duncan Paul Hand

Research output: Contribution to journalArticle

1 Citation (Scopus)
7 Downloads (Pure)

Abstract

This article investigates picosecond and sub-picosecond laser micromachining of Borofloat®33 glass and provides clear evidence that a simple modification of the laser beam scanning strategy can lead to significant improvement of machining efficiency and hence process throughput. Besides studying the impact of the fundamental laser machining parameters, such as laser fluence, pulse overlap, pulse repetition frequency (PRF), pulse duration and laser spot diameter, on the machined depth, surface roughness and material removal rate (MRR), it also compares the machining results for two different laser beam scanning strategies, called here "sequential” method (SM) and “interlaced” method (IM). By changing the scanning strategy from SM to IM, the MRR can be significantly increased because IM allows high-quality machining of the glass at higher PRF values. The experimental results show that this simple, cost-free modification allows the MRR value to be increased by more than 4 times, i.e. from 0.12 mm3/s to 0.53 mm3/s. Moreover, by using a Phantom V2512 high-speed camera, the picosecond laser micromachining process using both SM and IM was filmed. The videos show that SM leads to the accumulation of glass particles within the laser-machined area, whereas in IM the glass material is removed layer by layer which leads to the generation of “cleaner” and deeper areas. The mechanisms associated with these machining improvements are discussed.
Original languageEnglish
Article number116807
Number of pages12
JournalJournal of Materials Processing Technology
Volume285
Early online date18 Jun 2020
DOIs
Publication statusE-pub ahead of print - 18 Jun 2020

Keywords

  • Glass
  • Interlaced machining
  • Laser micromachining
  • Laser process characterisation
  • Process throughput
  • Ultrashort pulse lasers

ASJC Scopus subject areas

  • Ceramics and Composites
  • Computer Science Applications
  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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