Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 45-52 |
| Seitenumfang | 8 |
| Fachzeitschrift | Laser and particle beams |
| Jahrgang | 28 |
| Ausgabenummer | 1 |
| Publikationsstatus | Veröffentlicht - März 2010 |
| Extern publiziert | Ja |
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 4.4J/cm2, while the Gaussian beam produced broad and bimodal distributions. The aerodynamic number frequency of the primary nanoparticulate fraction (40nm) was equal to the number frequency of the submicron agglomerate fraction (200nm) at laser fluence of 1J/cm 2. The Feret diameter of primary particles was 80nm. 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.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Atom- und Molekularphysik sowie Optik
- Physik und Astronomie (insg.)
- Physik der kondensierten Materie
- Ingenieurwesen (insg.)
- Elektrotechnik und Elektronik
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in: Laser and particle beams, Jahrgang 28, Nr. 1, 03.2010, S. 45-52.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Influence of beam intensity profile on the aerodynamic particle size distributions generated by femtosecond laser ablation
AU - Menéndez-Manjn, A.
AU - Barcikowski, S.
AU - Shafeev, G. A.
AU - Mazhukin, V. I.
AU - Chichkov, B. N.
PY - 2010/3
Y1 - 2010/3
N2 - 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 4.4J/cm2, while the Gaussian beam produced broad and bimodal distributions. The aerodynamic number frequency of the primary nanoparticulate fraction (40nm) was equal to the number frequency of the submicron agglomerate fraction (200nm) at laser fluence of 1J/cm 2. The Feret diameter of primary particles was 80nm. 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.
AB - 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 4.4J/cm2, while the Gaussian beam produced broad and bimodal distributions. The aerodynamic number frequency of the primary nanoparticulate fraction (40nm) was equal to the number frequency of the submicron agglomerate fraction (200nm) at laser fluence of 1J/cm 2. The Feret diameter of primary particles was 80nm. 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.
KW - Airborne nanoparticles
KW - Femtosecond laser ablation
KW - Size distribution
UR - http://www.scopus.com/inward/record.url?scp=77952332181&partnerID=8YFLogxK
U2 - 10.1017/S0263034609990553
DO - 10.1017/S0263034609990553
M3 - Article
AN - SCOPUS:77952332181
VL - 28
SP - 45
EP - 52
JO - Laser and particle beams
JF - Laser and particle beams
SN - 0263-0346
IS - 1
ER -