Pulse-width influence on the laser-induced structuring of CaF2 (111)

D. Ashkenasi, H. Varel, A. Rosenfeld, F. Noack, E. E.B. Campbell

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We have investigated the morphology of CaF2 (111) irradiated by 780 nm laser pulses of varying pulse width (200 fs-8 ns) with fluences above the damage threshold. Large differences can be observed which we relate to the mechanisms and dynamics of defect production in this wide band gap material. The best defined and most controllable ablation is obtained for laser pulse widths of a few picoseconds. For nanosecond and femtosecond pulses strong fracturing of the crystal is observed with damage outside the laser irradiated zone. This has a thermal origin for nanosecond pulses but a non-thermal origin for pulse widths below approximately 1 ps.

Original languageEnglish
Pages (from-to)103-107
Number of pages5
JournalApplied Physics A: Materials Science and Processing
Issue number2
StatePublished - Aug 1996


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