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Influence of beam intensity profile on the aerodynamic particle size distributions generated by femtosecond laser ablation

Published online by Cambridge University Press:  14 April 2010

A. Menéndez-Manjón ,
S. Barcikowski ,
G.A. Shafeev ,
V.I. Mazhukin  and
B.N. Chichkov
A. Menéndez-Manjón
Affiliation:
Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany
S. Barcikowski*
Affiliation:
Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany Excellence Cluster REBIRTH, Hollerithallee 8, D-30419 Hannover, Germany
G.A. Shafeev
Affiliation:
General Physics Institute, 38 Vavilov street, 119991, Moscow, Russia
V.I. Mazhukin
Affiliation:
Institute for Mathematical Modelling4A Miusskaya Pl., 125047, Moscow, Russia
B.N. Chichkov
Affiliation:
Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany Excellence Cluster REBIRTH, Hollerithallee 8, D-30419 Hannover, Germany
*
Address correspondence and reprint requests to: Stephan Barcikowski, Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany. E-mail: s.barcikowski@lzh.de
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Abstract

The dependence of nanoparticle size distributions on laser intensity profile was determined during infrared femtosecond laser ablation of silver targets in air. Laser parameters were adjusted to ablate at the same peak fluence with spatially homogeneous (flat-top) and inhomogeneous (Gaussian) intensity distributions formed by diffractive optical elements. Aerodynamic particle size was measured online by an electric low-pressure cascade impactor. Narrower size distributions were detected for the flat-top intensity profile in the fluence range from 0.6 to 4.4 J/cm2, while the Gaussian beam produced broad and bimodal distributions. The aerodynamic number frequency of the primary nanoparticulate fraction (40 nm) was equal to the number frequency of the submicron agglomerate fraction (200 nm) at laser fluence of 1 J/cm2. The Feret diameter of primary particles was 80 nm. Geometrical interpretation of the irradiated spots at the corresponding laser fluence regimes explains the formation of bimodal (submicron and nanoparticulate) size distribution in the case of Gaussian beams. The bimodality is attributed to different thermalization pathways during laser ablation.

Keywords

Airborne nanoparticlesFemtosecond laser ablationSize distribution
Type
Research Article
Information
Laser and Particle Beams , Volume 28 , Issue 1 , March 2010 , pp. 45 - 52
Copyright
Copyright © Cambridge University Press 2010

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