Physics of shock-wave generation by laser plasma in water confinement regime

Berthe, Laurent; Sollier, Arnaud; Peyre, Patrice; Carboni, Christelle; Bartnicki, Eric; Fabbro, R.

doi:10.1117/12.407374

Cited by 7 publications

(4 citation statements)

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“…In addition to the usual regime of free-expanding plasma from the irradiated front surface of the film, some experiments were performed when a transparent fused silica window was set adjacent to the film. It confined plasma expansion towards the laser beam in the same manner as the water layer did in early experiments [7][8][9][10][11][12][13][14][15][16][17][18][19]. This increased the SW velocity in the confinement regime by a factor 1.3-1.4.…”

Section: Acceleration Of Thin Films and Generation Of Forward Swsmentioning

confidence: 85%

“…Shorter radiation wavelengths were favourable for lower water breakdown although it seemed to be not at the surface but in the bulk of water above the confined plasma. Unlike the detrimental effect of short laser wavelengths on water breakdown, the confined laser interaction was shown to be more efficient in UV than IR laser irradiation [17,19].…”

Section: Introductionmentioning

confidence: 94%

“…[8][9][10][11][12]). More elaborate experiments were performed by Fabbro et al [13][14][15][16][17][18][19] with a variety of laser wavelengths (λ = 1.064, 0.532, 0.355 and 0.308 µm) and pulse durations (150, 50, 25, 3 and 0.6 ns), with the goal of developing of novel technologies for materials processing by means of surface hardening. The predictions of a simple model [13] were confirmed by these experiments, which gave for an aluminium target confined with water a peak pressure p ∼ 5 GPa (50 kbar) at laser intensity q = 10 GW cm −2 and laser pulse duration 25 ns.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics of high-energy GARPUN KrF laser interaction with solid and thin-film targets in ambient air

Bakaev¹,

Batani²,

Krasnyuk³

et al. 2005

J. Phys. D: Appl. Phys.

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Hydrodynamic regimes of KrF laser interaction with solid and thin-film targets in air at atmospheric and reduced pressures were investigated at the high-energy GARPUN facility. These experiments were performed with 100 J, 100 ns laser pulses in planar focusing geometry and compared with numerical simulations with the ATLANT code to verify the concept of the laser-driven shock tube (LST). Strong shock waves (SWs) are produced in the LST and the gas is accelerated to hypersonic velocity due to the deposition of laser energy. The laser beam is focused by a prism raster optical system that provides a very uniform intensity distribution at moderate laser intensities q ⩽ 1 GW cm−2 over a square spot of ∼1 cm size. Dynamics of laser-produced plasma and SWs in a surrounding gas were investigated by means of a high-speed photo-chronograph and streak camera in combination with shadow or schlieren techniques, and time and space resolved spectroscopy in the visible spectral range. Both experiments and simulations confirmed that target evaporation and blow-up of expanding plasma are the main mechanisms of UV laser–target interaction in the surrounding gas. Planar SWs with velocities up to 7 km s−1 towards the laser beam were observed in normal-density air and up to 30 km s−1 in rarefied air. Acceleration of thin CH films of 1–50 µm thickness was investigated both in free-expansion and plasma-confined regimes with the highest achieved velocities being up to 4 km s−1. The SW damping law in free space, independent of laser intensity and air pressure, could be approximated by a power law x ∼ tn with power indices n1 = 0.85–0.95 at the initial stage and n2 = 0.5–0.6 later, when the distance of the SW front from the target became comparable with the size of the irradiated spot. Instability growth at contact interfaces between ablative plasma and accelerated film, as well as between plasma and compressed air were observed, and compared for various initial irradiation non-uniformities. These non-uniformities were introduced by a grid, which was placed in front of the film target.

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Section: Acceleration Of Thin Films and Generation Of Forward Swsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

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Hydrodynamics of high-energy GARPUN KrF laser interaction with solid and thin-film targets in ambient air

Bakaev¹,

Batani²,

Krasnyuk³

et al. 2005

J. Phys. D: Appl. Phys.

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“…This first step depends on the initial metal reflectivity, hence it depends on both the used metal and its surface state. However, at the high laser intensities used in the laser shock (>1 GW/cm², far from the ablation threshold of metals typically of approximately 0.2 GW/cm²), losses associated with this mechanism have been shown to be negligible [40,41] and independent of the used metal. Furthermore, this step is considered to be almost instantaneous in the whole process.…”

Section: Main Plasma Generationmentioning

confidence: 99%

Review on Laser Interaction in Confined Regime: Discussion about the Plasma Source Term for Laser Shock Applications and Simulations

Rondepierre

Sollier

Videau

et al. 2021

Metals

Self Cite

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This review proposes to summarize the development of laser shock applications in a confined regime, mainly laser shock peening, over the past 50 years since its discovery. We especially focus on the relative importance of the source term, which is directly linked to plasma pressure. Discussions are conducted regarding the experimental setups, experimental results, models and numerical simulations. Confined plasmas are described and their specific properties are compared with those of well-known plasmas. Some comprehensive keys are provided to help understand the behavior of these confined plasmas during their interaction with laser light to reach very high pressures that are fundamental for laser shock applications. Breakdown phenomena, which limit pressure generation, are also presented and discussed. A historical review was conducted on experimental data, such as pressure, temperature, and density. Available experimental setups used to characterize the plasma pressure are also discussed, and improvements in metrology developed in recent years are presented. Furthermore, analytical and numerical models based on these experiments and their improvements, are also reviewed, and the case of aluminum alloys is studied through multiple works. Finally, this review outlines necessary future improvements that expected by the laser shock community to improve the estimation of the source term.

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1.14 Laser Peening of Metallic Materials

İrizalp

Saklakoğlu

2017

Comprehensive Materials Finishing

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Physics of shock-wave generation by laser plasma in water confinement regime

Cited by 7 publications

References 0 publications

Hydrodynamics of high-energy GARPUN KrF laser interaction with solid and thin-film targets in ambient air

Hydrodynamics of high-energy GARPUN KrF laser interaction with solid and thin-film targets in ambient air

Review on Laser Interaction in Confined Regime: Discussion about the Plasma Source Term for Laser Shock Applications and Simulations

1.14 Laser Peening of Metallic Materials

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