Amoruso, Salvatore and Bruzzese, Riccardo (2007) Femtosecond laser ablation of nickel in vacuum. [Pubblicazione in rivista scientifica]

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Item Type: Pubblicazione in rivista scientifica
Language: English
Title: Femtosecond laser ablation of nickel in vacuum
Creators:
CreatorsEmail
Amoruso, SalvatoreUNSPECIFIED
Bruzzese, RiccardoUNSPECIFIED
Autor/s: S. AMORUSO; R. BRUZZESE; WANG X; NEDIALKOV N.N; ATANASOV P.A
Date: 2007
Number of Pages: 10
Department: Scienze fisiche
Identification Number: 10.1088/0022-3727/40/2/008
Journal or Publication Title: JOURNAL OF PHYSICS D-APPLIED PHYSICS
Publisher: IOP Publishing Limited:Dirac House, Temple Back, Bristol BS1 6BE United Kingdom:011 44 117 9297481, EMAIL: custserv@iop.org, INTERNET: http://www.iop.org, Fax: 011 44 117 9294318
Date: 2007
Volume: 40
Page Range: pp. 331-340
Number of Pages: 10
Identification Number: 10.1088/0022-3727/40/2/008
Date Deposited: 20 Oct 2010 08:35
Last Modified: 30 Apr 2014 19:42
URI: http://www.fedoa.unina.it/id/eprint/6902

Abstract

We present an experimental characterization and a theoretical analysis of ultrashort laser ablation of a nickel target, which highlights the more general and peculiar features of femtosecond (fs) laser ablation of metals. The study has been carried out by using visible (527 nm) laser pulses of ≈300 fs duration. The vacuum expansion dynamics of the ablated species has been investigated by using fast photography and optical emission spectroscopy, while the fs laser pulse–metal interaction has been studied theoretically by means of molecular dynamics simulations. Special attention has been given to the study of the dependence of ablation depth on laser fluence, which has been carried out by comparing the SEM analysis of micro-holes drilled into the nickel samples with the predictions of the theoretical model. The main outcomes of our investigation, which are very satisfactorily reproduced and accounted for by the theoretical model, are (i) the nonlinear dependence of the ablation yield on the laser fluence, and its reliance to the electron heat diffusion, in the process of redistribution of the absorbed energy, (ii) the splitting of the material blow-off into two main classes of species, atoms and nanoparticles, characterized by different expansion dynamics, and (iii) the different degrees of heating induced by the laser pulse at different depths into the material, which causes the simultaneous occurrence of various ablation mechanisms, eventually leading to atoms and nanoparticles ejection.

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