High speed cleaving of crystals with ultrafast Bessel beams

L. Rapp, R. Meyer, L. Furfaro, C. Billet, R. Giust, F. Courvoisier*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)


We develop a novel concept for ultra-high speed cleaving of crystalline materials with femtosecond lasers. Using Bessel beams in single shot, fracture planes can be induced nearly all along the Bessel zone in sapphire. For the first time, we show that only for a pulse duration below 650 fs, a single fracture can be induced in sapphire, while above this duration, cracks appear in all crystallographic orientations. We determine the influential parameters which are polarization direction, crystallographic axes and scanning direction. This is applied to cleave sapphire with a spacing as high as 25μm between laser impacts.

Original languageEnglish
Pages (from-to)9312-9317
Number of pages6
JournalOptics Express
Issue number8
Publication statusPublished - 17 Apr 2017
Externally publishedYes


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