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Time-resolved observation of the plasma induced by laser metal ablation in air at atmospheric pressure
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10.1063/1.3503877
/content/aip/journal/jap/108/9/10.1063/1.3503877
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/9/10.1063/1.3503877
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Schematic of the experimental setup; (b) temporal shape of the laser pulse.

Image of FIG. 2.
FIG. 2.

ICCD images of laser-induced plasma at different delay times and laser pulse fluences (titanium target; the 1064 nm laser pulse starts at and completes at ; laser beam propagates downwards and the target surface is located at the bottom of the images).

Image of FIG. 3.
FIG. 3.

The contour plots of normalized radiation intensity distribution for laser-induced plasma at different delay times and laser pulse fluences (titanium target; laser parameters are the same as Fig. 2; the horizontal and vertical coordinates are in micron).

Image of FIG. 4.
FIG. 4.

(a) The coordinate system setup; (b) the radiation intensity distribution along z axis at at different delay times for laser-induced plasma (the titanium target surface is located at around ; laser pulse fluence: ; the 1064 nm laser pulse starts at and completes at ).

Image of FIG. 5.
FIG. 5.

The transient front location of laser-induced plasma at [based on the coordinate system in Fig. 4(a)] for different laser fluences (the 1064 nm laser pulse starts at and completes at ; the titanium target surface is located at ; the fitting curves are based on Eq. (2) with constant ).

Image of FIG. 6.
FIG. 6.

The transient front location of laser-induced plasma at [based on the coordinate system in Fig. 4(a)] for different targets (the 1064 nm laser pulse starts at and completes at ; laser fluence: ; the fitting curves are based on Eq. (2) with constant ; the target surface is located at ).

Image of FIG. 7.
FIG. 7.

The transient front location of laser-induced plasma (the 1064 nm laser pulse starts at and completes at ; laser fluence: ; titanium target; rectangles represent measurements; the two fitting curves are obtained through the least-square method based on Eq. (2) using (i) constant , and (ii) (if ) and (if ), where is a fitting constant).

Image of FIG. 8.
FIG. 8.

The transient front location of laser-induced plasma for different laser fluences (the 1064 nm laser pulse starts at and completes at ; the titanium target surface is located at ; rectangles represent measurements; the fitting curves are based on Eq. (2) using (if ) and (if ), where is a fitting constant).

Image of FIG. 9.
FIG. 9.

The curve-fitting errors [defined in Eq. (3)] based on the blast-wave theory (titanium target; laser pulse duration: 200 ns, wavelength: 1064 nm; the fitting curves are obtained through the least-square method based on Eq. (2) using (i) constant , and (ii) (if ) and (if ), where is a constant).

Image of FIG. 10.
FIG. 10.

(a) The values of for the best least-square fitting of the measurements using Eq. (2); (b) the ratios of over the incoming laser pulse energy (laser pulse duration: 200 ns, wavelength: 1064 nm).

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/content/aip/journal/jap/108/9/10.1063/1.3503877
2010-11-02
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Time-resolved observation of the plasma induced by laser metal ablation in air at atmospheric pressure
http://aip.metastore.ingenta.com/content/aip/journal/jap/108/9/10.1063/1.3503877
10.1063/1.3503877
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