Femtosecond laser ablation of metals: precise measurement and analytical model for crater profiles

Masaki Hashida; Masayuki Fujita; Masahiro Tsukamoto; Alexandre F. Semerok; Olivier Gobert; Guillaume Petite; Yasukazu Izawa; J.-F. Wagner

doi:10.1117/12.486538

19 February 2003 Femtosecond laser ablation of metals: precise measurement and analytical model for crater profiles

Masaki Hashida, Masayuki Fujita, Masahiro Tsukamoto, Alexandre F. Semerok, Olivier Gobert, Guillaume Petite, Yasukazu Izawa, J.-F. Wagner

Author Affiliations +

Proceedings Volume 4830, Third International Symposium on Laser Precision Microfabrication; (2003) https://doi.org/10.1117/12.486538
Event: LAMP 2002: International Congress on Laser Advanced Materials Processing, 2002, Osaka, Japan

Abstract

Laser ablation of Cu, Al, Fe, Zn, Ni, Pb, and Mo by short pulse laser (800nm wavelength, 70fs pulse duration, 0.01-28 J/cm² fluence range) in air was studied. Three different ablation thresholds were distinguished in all metals. The lowest ablation threshold was of one order of magnitude lower than the one observed previously. In the fluence range of 0.018-0.18 J/cm² the ablation rate was ≈0.01 nm/pulse. A dependence of the threshold on the pulse duration was demonstrated in the range of 70 fs- 5 ps for cupper. As the laser pulse duration increased, the ablation threshold had the tendency to be higher. A periodic structure was observed at the bottom of the crater in all metals. The spacing d of the patterned structure was determined to be d=300±40 nm for 0.07 J/cm² and d=600±40 nm for 0.22 J/cm². The spacing depended on the laser fluence rather than on laser wavelength.

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Masaki Hashida, Masayuki Fujita, Masahiro Tsukamoto, Alexandre F. Semerok, Olivier Gobert, Guillaume Petite, Yasukazu Izawa, and J.-F. Wagner "Femtosecond laser ablation of metals: precise measurement and analytical model for crater profiles", Proc. SPIE 4830, Third International Symposium on Laser Precision Microfabrication, (19 February 2003); https://doi.org/10.1117/12.486538

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