Laser-produced blast wave and numerical simulation using the FLASH 
code

Farley, D. R.; Shigemori, K.; Azechi, H.

doi:10.1017/s026303460505069x

Cited by 4 publications

(2 citation statements)

References 11 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The remarkable difference in the radiation-supported expansion in the picosecond and nanosecond regimes may be explained by the higher temperatures in the case of the shorter pulses with higher power density. For the energy and power densities considered, the numerical results reveal maximum temperatures of 4×10 5 K in the laser-driven shockwave for the nanosecond experiments and up to 4×10 6 K close to the target in the case of the picosecond experiments [6,8].…”

Section: Numerical Resultsmentioning

confidence: 96%

“…Figures 3 and 4 show both the experimentally measured longitudinal plasma expansion above BK7-glass (rectangular data points as deduced from the shadowgrams) and the results of a numerical simulation (PLATINI code developed at ISL) based on a hydrodynamic theory including a simple diffusion model of grey radiation (one-group transport, mean Rosseland opacity) [6].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Plasma formation during the interaction of picosecond and nanosecond laser pulses with BK7 glass

Borchert¹,

Darée²,

Hugenschmidt³

2005

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

This presentation deals with the dynamics of the high-irradiance short-pulse laser exposure of dielectric materials in normal atmosphere. Time-resolved recordings of plasma ignition and expansion have been obtained for picosecond (tP = 35 ps) and nanosecond pulses (tP = 10 ns) with identical pulse energy densities at the target. In the case of picosecond pulses, a rather homogeneous plasma layer is created, which remains closely attached to the target surface, reaching a depth of a few tens of micrometres during the pulse duration, tP. Ahead of this layer, rapidly expanding plasma jets could be visualized by shadowgraphy. After laser irradiation the plasma core expands while the jets decay. In contrast to the commonly known theory of laser-supported detonation waves in atmosphere, the plasma expansion up to a time of several tP is mainly driven by radiative energy transport. In contrast, for nanosecond pulses at comparable energy densities, the plasma expansion is largely determined by hydrodynamic processes. Detailed experimental studies have been carried out and the results are compared with numerical results.

show abstract

Section: Numerical Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Plasma formation during the interaction of picosecond and nanosecond laser pulses with BK7 glass

Borchert¹,

Darée²,

Hugenschmidt³

2005

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

Short-Pulse Laser-Driven Strong Shock Waves

Jakubowska

2018

Springer Series in Chemical Physics

View full text Add to dashboard Cite

Observation of laser ablation of silicon as a function of pulse length at constant fluence via time-resolved x-ray spectroscopy

Joshi,

Bailly-Grandvaux,

Turner

et al. 2023

Physics of Plasmas

View full text Add to dashboard Cite

We investigate the ablation of silicon as a function of laser pulse length at a constant fluence using time-resolved x-ray spectroscopy data obtained from OMEGA EP experiments at the University of Rochester's Laboratory for Laser Energetics. Our targets consisted of three-layer planar structures composed of Si (50 μm), Cu (25 μm), and SiO2 (500 μm) layers. The Si layer was irradiated by a 351-nm laser with varying pulse widths of 250 ps, 500 ps, 1 ns, and 10 ns while maintaining a constant fluence of ∼27.9 kJ/cm2. Electron temperatures and densities of the ablated plasma were determined by analyzing the time-resolved x-ray spectroscopy data through a comparison of experimental measurements with synthetic results obtained from Si atomic calculations in a steady state and non-local thermodynamic equilibrium. These calculations were computed using PrismSPECT [MacFarlane et al., High Energy Density Phys. 3, 181 (2007)]. Additionally, radiation-hydrodynamics simulations with FLASH are used to generate simulated plasma-density and plasma-temperature profiles, which are then compared with the experimental measurements. Our analyses reveal that increasing the laser pulse length at a constant fluence results in a decrease in electron temperatures and densities. Furthermore, the longer pulses with lower intensities lead to deeper ablation regions before reaching the peak ablation but lower ionization balances in the silicon layer. These findings emphasize the critical role of laser pulse length in plasma ablation and shock generation for laser-impulse studies.

show abstract

Laser-produced blast wave and numerical simulation using the FLASH code

Cited by 4 publications

References 11 publications

Plasma formation during the interaction of picosecond and nanosecond laser pulses with BK7 glass

Plasma formation during the interaction of picosecond and nanosecond laser pulses with BK7 glass

Short-Pulse Laser-Driven Strong Shock Waves

Observation of laser ablation of silicon as a function of pulse length at constant fluence via time-resolved x-ray spectroscopy

Contact Info

Product

Resources

About