Laser-induced shockwave propagation from ablation in a cavity

Zeng, Xiangbo; Mao, Xianglei; Mao, Samuel S.; Wen, Sy-Bor; Greif, R.; Russo, Richard E.

doi:10.1063/1.2172738

Cited by 89 publications

(38 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…One can expect that laser channeling into dense plasma can be improved by employing a suitably designed train of laser pulses. The scheme is similar to precision hole boring of solid materials by multiple short-pulse lasers at the 10 14 w cm 22 level (Bogaerts et al, 2003;Zeng et al, 2006;Wolowski et al, 2007), although the physics is somewhat different. There the repeated action of the short pulses allows the material to be photo-ionized and removed layer by layer at the atomic level, without overheating the hole walls and causing uncontrolled particle emission.…”

Section: Resultsmentioning

confidence: 97%

Plasma channeling by multiple short-pulse lasers

Cao

et al. 2009

Laser Part. Beams

View full text Add to dashboard Cite

Channeling by a train of laser pulses into homogeneous and inhomogeneous plasmas is studied using particle-in-cell simulation. When the pulse duration and the interval between the successive pulses are appropriate, the laser pulse train can channel into the plasma deeper than a single long-pulse laser of similar peak intensity and total energy. The increased penetration distance can be attributed to the repeated actions of the ponderomotive force, the continuous between-pulse channel lengthening by the inertially evacuating ions, and the suppression of laser-driven plasma instabilities by the intermittent laser-energy cut-offs.

show abstract

Section: Resultsmentioning

confidence: 97%

Plasma channeling by multiple short-pulse lasers

Cao

et al. 2009

Laser Part. Beams

View full text Add to dashboard Cite

show abstract

“…This unwanted damage occurs as a by-product of the ablation of the material due to high-intensity laser pulses. The main factors contributing to the individual types of damage caused by a single laser shot have been studied extensively [8][9][10][11][12][13][14][15][16]; the shock originating from the photoexcited region generates microscopic cracks, while the high heat leads to modifications in the material. Meanwhile, the damage caused by repeated application of laser beams has been investigated mainly from the aspect of excited electrons [17,18].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of damage formation in glass in the process of femtosecond laser drilling

et al. 2018

View full text Add to dashboard Cite

The development of femtosecond lasers has renovated micromachining technology, enabling the microdrilling of transparent materials at high speed. Although effective, this technique is still imperfect because irregular microscopic damage occurs during processing. Several factors in the formation of damage induced by a single laser pulse have been suggested; however, the entire mechanisms of damage formation in the process of drilling are not fully understood. Here we investigated the causes of microscopic damage both by experimentally carrying out laser drilling on chemically strengthened glass samples and by numerically analyzing the propagating stress wave and temperature distribution. We have revealed that the damage at the sidewall and bottom of a generated hole is mainly due to the stress wave, while the damage around the hole entrance is mainly due to relaxation of thermal stress. In particular, we have analyzed these processes quantitatively, demonstrating the time courses of the passage of the stress wave through the material and the temperature distribution generated by the excited electrons. Our analyses are useful in suggesting processing techniques, or suggesting glass materials suitable for laser drilling such as glass with high heat resistance, which may lead to an improvement in the quality of micromachining.

show abstract

“…3(a), with the 50-nm commercial aluminumnanoparticle samples exhibiting the most rapid shock-wave expansion over the first 10 ls. Prior studies concerned with probing the shock-wave velocities associated with a variety of laser-initiated expansions, including ablation and plasmaforming processes, 20,[26][27][28] have used classical Taylor-Sedov (T-S) blast-wave theory [29][30][31] or modified variations thereof that account for drag forces associated with the surrounding medium. 26,27 Classical T-S theory assumes that an initial instantaneous input of energy produces a shock wave that is emitted from a point source, which results in a simple expression for the time (t) dependence of the expanding shock-front radius, r, as follows:…”

Section: A Temporally Resolved Shadowgraphy Of Shock Propagationmentioning

confidence: 99%

Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles

Roy

Jiang

Stauffer

et al. 2013

Journal of Applied Physics

View full text Add to dashboard Cite

Spatially and temporally resolved temperature measurements behind an expanding blast wave are made using picosecond (ps) N2 coherent anti-Stokes Raman scattering (CARS) following laser flash heating of mixtures containing aluminum nanoparticles embedded in ammonium-nitrate oxidant. Production-front ps-CARS temperatures as high as 3600 ± 180 K-obtained for 50-nm-diameter commercially produced aluminumnanoparticle samples-are observed. Time-resolved shadowgraph images of the evolving blast waves are also obtained to determine the shock-wave position and corresponding velocity. These results are compared with near-field blast-wave theory to extract relative rates of energy release for various particle diameters and passivating-layer compositions.Keywords aluminum nanoparticles, coherent anti-Stokes Raman scattering, energetic nanoparticles, energy release, laser flash-heating, particle diameters, relative rates, coherent scattering, Raman spectroscopy Disciplines Mechanical Engineering CommentsThe following article appeared in Journal of Applied Physics 113, 184310 (2013) Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles Spatially and temporally resolved temperature measurements behind an expanding blast wave are made using picosecond (ps) N 2 coherent anti-Stokes Raman scattering (CARS) following laser flash heating of mixtures containing aluminum nanoparticles embedded in ammonium-nitrate oxidant. Production-front ps-CARS temperatures as high as 3600 6 180 K-obtained for 50-nmdiameter commercially produced aluminum-nanoparticle samples-are observed. Time-resolved shadowgraph images of the evolving blast waves are also obtained to determine the shock-wave position and corresponding velocity. These results are compared with near-field blast-wave theory to extract relative rates of energy release for various particle diameters and passivating-layer compositions. V C 2013 AIP Publishing LLC.[http://dx

show abstract

Laser-induced shockwave propagation from ablation in a cavity

Cited by 89 publications

References 15 publications

Plasma channeling by multiple short-pulse lasers

Plasma channeling by multiple short-pulse lasers

Mechanisms of damage formation in glass in the process of femtosecond laser drilling

Spatially and temporally resolved temperature and shock-speed measurements behind a laser-induced blast wave of energetic nanoparticles

Contact Info

Product

Resources

About