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Early-stage plasma dynamics with air ionization during ultrashort laser ablation of metal
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10.1063/1.3633067
/content/aip/journal/pop/18/9/10.1063/1.3633067
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/9/10.1063/1.3633067

Figures

Image of FIG. 1.
FIG. 1.

Schematics of the simulation method and domain, with Cu as the target.

Image of FIG. 2.
FIG. 2.

Simulated electron number density evolution of laser spark in N2 at two different laser power density levels. (a) Simulation data from Ref. 57 and (b) simulation data obtained in this study. Laser wavelength: 400 nm and pulse duration: 100 fs.

Image of FIG. 3.
FIG. 3.

Refractive index of laser spark in the air. Laser wavelength: 800 nm; pulse duration: 100 fs; and power density: 4.2 × 1014 W/cm2. Measurement data are from Ref. 1.

Image of FIG. 4.
FIG. 4.

(Color online) Simulated (a) near-surface and (b)∼(d) plasma front electron number density evolution at different delay times. Laser wavelength: 800 nm; pulse duration: 50 fs; power density: 4.4 × 1013 W/cm2; and target: Cu.

Image of FIG. 5.
FIG. 5.

(Color online) Simulated (a) near-surface and (b) plasma front electron number density evolution at different delay times, without repulsive field considered. Laser wavelength: 800 nm; pulse duration: 50 fs; power density: 4.4 × 1013 W/cm2; and target: Cu.

Image of FIG. 6.
FIG. 6.

Simulated evolution of the plasma front with an electron number density of 2.92 × 1021 cm−3. Laser wavelength: 620 nm; pulse duration: 77 fs; power density: 3 × 1015 W/cm2; and target: Al. Measurement data are from Ref. 5.

Image of FIG. 7.
FIG. 7.

Absorptance as a function of laser power density. For simulation, laser wavelength is 620 nm and pulse duration is 77 fs. Measurement data are from Ref. 60 with laser wavelength of 800 nm and pulse duration of 120 fs.

Image of FIG. 8.
FIG. 8.

(Color online) Schematic of the pump-probe shadowgraph measurement.

Image of FIG. 9.
FIG. 9.

Cu plasma expansion at successive delay times. (a) The focal point is slightly above the surface, case I; (b) the focal point is slightly below the surface, case II. Laser wavelength: 800 nm; pulse duration: 100 fs; power density: 4.2 × 1014 W/cm2; and target: Cu.

Image of FIG. 10.
FIG. 10.

(Color online) Plasma longitudinal and radial expansion positions at successive delay times for the two cases I and II as in Fig. 9. Laser wavelength: 800 nm; pulse duration: 100 fs; power density: 4.2 × 1014 W/cm2; and target: Cu.

Image of FIG. 11.
FIG. 11.

The second derivative of the index of refraction (scaled and in arbitrary unit), shown along the longitudinal plasma expansion direction on its related shadowgraph image, at the delay time of 70 ps of case I. Laser wavelength: 800 nm; pulse duration: 100 fs; power density: 4.2 × 1014 W/cm2; and target: Cu.

Image of FIG. 12.
FIG. 12.

Calculated and measured plasma front expansion for (a) case I and (b) case II. Laser wavelength: 800 nm; pulse duration: 100 fs; power density: 4.2 × 1014 W/cm2; and target: Cu.

Image of FIG. 13.
FIG. 13.

(Color online) Simulated spatial-temporal evolution of charged particle number density within the delay time of 70 ps for case I. (a) Total electron; (b) net charge. Laser wavelength: 800 nm; pulse duration: 100 fs; power density: 4.2 × 1014 W/cm2; and target: Cu.

Image of FIG. 14.
FIG. 14.

(Color online) Simulated spatial-temporal evolution of electron number density within the delay time of 100 ps for case II. (a) Electrons ejected from Cu; and (b) electrons freed from air. Laser wavelength: 800 nm; pulse duration: 100 fs; power density: 4.2 × 1014 W/cm2; and target: Cu.

Tables

Generic image for table
Table I.

Values of potential depth ɛ and atomic diameter σ.44,51

Generic image for table
Table II.

Values of dissociation energy D dis, equilibrium interatomic spacing r eq, and β.48,52

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/content/aip/journal/pop/18/9/10.1063/1.3633067
2011-09-09
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Early-stage plasma dynamics with air ionization during ultrashort laser ablation of metal
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/9/10.1063/1.3633067
10.1063/1.3633067
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