Dynamics of femtosecond laser ablation studied with time-resolved x-ray absorption fine structure imaging

Journal Article · Wed Apr 01 00:00:00 EDT 2009 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PHYSREVB.79.144106· OSTI ID:21294055

Oguri, Katsuya; Okano, Yasuaki; Nishikawa, Tadashi; Nakano, Hidetoshi ^[1]

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1. NTT Basic Research Laboratories, Nippon Telegraph and Telephone Corporation, 3-1 Morinosato Wakamiya, Atsugi, Kanagawa 243-0198 (Japan)

We studied the dynamics of the femtosecond laser ablation of aluminum in an energy range well above the ablation threshold with the ultrafast time-resolved x-ray-absorption fine structure imaging technique. Analyzing the spectral structures near the L absorption edge that appeared in one-dimensional images of soft-x-ray absorbance, we successfully identified doubly and singly charged ions, neutral atoms, liquid nanoparticles, and possible atomic clusters in the expanding ablation plume. We also clarified that the ejected particles depend strongly on the laser irradiation intensity. The spatiotemporal evolution of the ablation particles allows us to estimate the spatial distribution of atomic density and the ejection velocity of each type of particle. In particular, we discuss the temporal sequence of the particle ejection in the early stages of plume expansion. Our experimental results strongly support the idea that photomechanical fragmentation and vaporization are dominant mechanisms for the production of liquid nanoparticles and neutral atoms, respectively, in femtosecond laser ablation induced in an irradiation intensity range of 10{sup 14}-10{sup 15} W/cm{sup 2}.

• OSTI ID: 21294055
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 79, Issue 14; Other Information: DOI: 10.1103/PhysRevB.79.144106; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABLATION
ABSORPTION
ABSORPTION SPECTROSCOPY
ALUMINIUM
ATOMIC CLUSTERS
ENERGY RANGE
EVAPORATION
FINE STRUCTURE
FRAGMENTATION
IONS
IRRADIATION
LASER RADIATION
LIQUIDS
NANOSTRUCTURES
ONE-DIMENSIONAL CALCULATIONS
SOFT X RADIATION
SPATIAL DISTRIBUTION
TIME RESOLUTION
VELOCITY
X-RAY SPECTROSCOPY