Dynamics of femtosecond laser produced tungsten nanoparticle plumes

Harilal, S. S.; Farid, Nagy A.; Hassanein, A.; Kozhevin, V. M.

doi:10.1063/1.4833564

Cited by 40 publications

(27 citation statements)

References 41 publications

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“…Two components of the plume can be clearly observed: a fast moving component moving away from the target surface along with a slow moving component staying closer to the target even at later times. Such two-component plume structures have also been reported previously by others 3,9 for fs LA and the fast moving component essentially consists of atomic and ionic emission while nanoparticles composed of Cu and Zn contribute the emission features observed very close to the target. As seen in Fig.…”

Section: Resultssupporting

confidence: 85%

Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon

et al. 2014

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We investigated the expansion dynamics of fs laser ablated brass plasma in Ar at various pressure levels ranging from 10−5 Torr to atmospheric conditions using time-resolved and spectrally resolved two-dimensional imaging. Significant changes in plume morphology were noticed at varying pressure levels which included free expansion, spherical to cylindrical geometry changes, sharpening, and confinement. The temporal evolution of excited Cu and Zn species in the plume were imaged using narrow band-pass interference filters, and their hydrodynamic expansion features were compared. 2D imaging coupled with monochromatic line selection showed velocity differences, uneven distribution, and aspect ratio differences among the plume species. Plume morphological changes were found to be significant at intermediate pressure levels (∼10 Torr) where plasma emissivity was found to be maximum. The expansion features of plume were compared with various models and found to be generally in good agreement.

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Section: Resultssupporting

confidence: 85%

Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon

et al. 2014

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“…Previous studies showed that fs LA ejects significant nanoparticles (NP) at late times and emits a Planckian-type broadband distribution. 38 Moreover, it has been previously reported that nanoparticle velocity is about 1-2 orders lower than the plume propagation velocity. 20 So, we believe the occurrence of emission near LA zone at earlier and later times of fs LA is composed of a combination of blackbody-type emission from plasma continuum and nanoparticles which has also been reported by other experimental and simulation studies.…”

Section: Resultsmentioning

confidence: 99%

“…This decrease in temperature with distance matches with the theoretical description of adiabatic plume expansion where the plume is considered to expand isentropically as opposed to isothermally. 24,38,39,42,43 At moderate pressure levels ($1-10 Torr), confinement of the plume regulates the reduction in plasma temperature with space compared to the case in vacuum. At 10 Torr pressure levels, the plasma thermalization is evident at various distances from the target.…”

Section: B Plasma Characterization Using Optical Emission Spectroscopymentioning

confidence: 99%

Characterization of ultrafast laser-ablation plasma plumes at various Ar ambient pressures

Diwakar

Harilal

Phillips

et al. 2015

Journal of Applied Physics

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Dynamics of femto-and nanosecond laser ablation plumes investigated using optical emission spectroscopyRecently, we reported morphological changes in ultrafast laser ablation plumes in varying ambient pressures [Diwakar et al., J. Appl. Phys. 116, 133301 (2014)]. In this paper, we report the emission features of fs laser ablated brass plasma plumes at various Ar background pressure levels ranging from vacuum to atmospheric conditions and correlated to changes in plume morphology. Spatially resolved wavelength dispersed images of the plume were recorded for characterizing the spectral features at various pressure levels and also used for obtaining spatial distribution of Cu I and Zn I species in the plume, signal-to-noise ratios, and fundamental parameters of the plasma, specifically temperature and density. The spatial evolution of plasma temperature and density showed significant changes at various ambient pressure levels; these results were correlated to morphological changes seen in the plume images. Optical time-of-flight profiles were used to study time evolution of various species in the plume and indicated oscillations of ablation plumes at intermediate pressure levels. Possible mechanisms for observed changes in plume shape, optical emission intensity, and dual peak structures in time-of-flight profiles are discussed. V C 2015 AIP Publishing LLC.

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“…13 Furthermore, it is reported that ultrafast ablation of high-Z materials can lead to higher nanoparticle yield when compared to low-Z materials. 14 It is reported that ultrafast laser ablation is one of the ways to produce nanoparticles of any material independent of the specific material properties, as the timescales involving ultrafast laser heating and material relaxation process are in the order of picoseconds.…”

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confidence: 99%

Time of flight emission spectroscopy of laser produced nickel plasma: Short-pulse and ultrafast excitations

Smijesh

Chandrasekharan

Joshi

et al. 2014

Journal of Applied Physics

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We report the experimental investigation and comparison of the temporal features of short-pulse (7 ns) and ultrafast (100 fs) laser produced plasmas generated from a solid nickel target, expanding into a nitrogen background. When the ambient pressure is varied in a large range of 10 À6 Torr to 10 2 Torr, the plume intensity is found to increase rapidly as the pressure crosses 1 Torr. Time of flight (TOF) spectroscopy of emission from neutral nickel (Ni I) at 361.9 nm (3d 9 ( 2 D) 4p ! 3d 9 ( 2 D) 4s transition) reveals two peaks (fast and slow species) in short-pulse excitation and a single peak in ultrafast excitation. The fast and slow peaks represent recombined neutrals and un-ionized neutrals, respectively. TOF emission from singly ionized nickel (Ni II) studied using the 428.5 nm (3p 6 3d 8 ( 3 P) 4s! 3p 6 3d 9 4s) transition shows only a single peak for either excitation. Velocities of the neutral and ionic species are determined from TOF measurements carried out at different positions (i.e., at distances of 2 mm and 4 mm, respectively, from the target surface) on the plume axis. Measured velocities indicate acceleration of neutrals and ions, which is caused by the Coulomb pull of the electrons enveloping the plume front in the case of ultrafast excitation. Both Coulomb pull and laser-plasma interaction contribute to the acceleration in the case of short-pulse excitation. These investigations provide new information on the pressure dependent temporal behavior of nickel plasmas produced by short-pulse and ultrafast laser pulses, which have potential uses in applications such as pulsed laser deposition and laser-induced nanoparticle generation. V C 2014 AIP Publishing LLC. [http://dx.

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Dynamics of femtosecond laser produced tungsten nanoparticle plumes

Cited by 40 publications

References 41 publications

Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon

Expansion dynamics of ultrafast laser produced plasmas in the presence of ambient argon

Characterization of ultrafast laser-ablation plasma plumes at various Ar ambient pressures

Time of flight emission spectroscopy of laser produced nickel plasma: Short-pulse and ultrafast excitations

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