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Shock pressures induced in condensed matter by laser ablation
Damian C Swift1, Thomas E Tierney, Roger A Kopp
1P-24 Plasma Physics, Los Alamos National Laboratory, MS E526, Los Alamos, New Mexico 87545, USA. dswift@lanl.gov
Summary
Researchers used the Trident laser to create shock waves in solid elements, revealing pressure-irradiance relationships. This work advances understanding of dynamic material properties under extreme conditions.
Area of Science:
- Physics
- Materials Science
- Plasma Physics
Background:
- High-intensity lasers can induce extreme states in materials.
- Understanding material response to shock waves is crucial for various scientific and engineering applications.
Purpose of the Study:
- To investigate shock wave generation and material states induced by laser ablation.
- To establish relationships between laser irradiance and induced pressure in solid elements.
- To validate radiation hydrodynamics models for simulating these extreme states.
Main Methods:
- Utilized the Trident laser system with 527 nm pulses to ablate solid element samples (Be to Au).
- Employed laser Doppler velocimetry to measure surface velocity histories.
- Performed radiation hydrodynamics simulations incorporating detailed plasma physics and energy transport.
Main Results:
- Inferred relationships between laser irradiance and induced pressure, showing pressure is not constant with constant irradiance over time.
- Successfully reproduced experimental data using advanced simulation models, including conductivity-dependent laser energy deposition and radiation diffusion.
- Demonstrated that induced solid states are relatively insensitive to plasma modeling details.
Conclusions:
- Experiments of this type can estimate Hugoniot points with appropriate plasma models.
- The findings support applications in generating dynamic loading for studying material strength and phase transitions.
- This research provides a foundation for material recovery experiments under extreme conditions.