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Ablation-induced explosion of metal using a high-power Nd:YAG laser
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Image of FIG. 1.
FIG. 1.

(a) Inert shock-contact structure of laser experiment, (b) detonation front structure not observed in laser experiment.

Image of FIG. 2.
FIG. 2.

Schematic of light source layout for laser-assisted blast wave generation.

Image of FIG. 3.
FIG. 3.

Explosive vaporization of copper, aluminum, brass by 20, laser intensities shown in the increasing order of time sequence.

Image of FIG. 4.
FIG. 4.

Measured shock velocity, , for copper ablation at .

Image of FIG. 5.
FIG. 5.

Planar to spherical structure transition shown during and for aluminum. For the copper case, this transition occurred at as shown in Fig. 4.

Image of FIG. 6.
FIG. 6.

Measured shock velocity for metal ablation at .

Image of FIG. 7.
FIG. 7.

Planar (1D) structure of initial blast wave as multigas (aluminum vapor and air) shock tube problem computed by the high-resolution hydrocode developed for shock compression of condensed matter (Ref. 20). Density (a) and pressure (b) profiles are shown at two different times suggesting a shock velocity of . Calculated states match experimental data for aluminum at 75 ns.

Image of FIG. 8.
FIG. 8.

Theoretical states behind the leading (spherical) shock at for given shocked air states . For aluminum at , , , and .


Generic image for table
Table I.

Fraction of laser intensity absorbed by the metal targets at .

Generic image for table
Table II.

Theoretical Hugoniot properties of laser-induced shock (air) state during the first 1000 ns of beam. Shock speed is measured (with error).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ablation-induced explosion of metal using a high-power Nd:YAG laser