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Ablation pressure scaling at short laser wavelength
D Batani1, H Stabile, A Ravasio
1Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano Bicocca and INFM, Piazza della Scienza 3, 20126 Milan, Italy.
Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 3, 2004
Summary
Ablation pressure was measured using shock breakout in aluminum targets at high laser irradiance. Results align with analytical models, advancing understanding of laser-matter interactions.
Area of Science:
- Physics
- Materials Science
- Laser-Plasma Interactions
Background:
- Understanding laser-induced ablation pressure is crucial for applications like inertial confinement fusion and materials processing.
- Previous studies often faced challenges with energy transport and drilling effects, complicating pressure measurements.
Purpose of the Study:
- To accurately measure ablation pressure at a 0.44-micrometer laser wavelength.
- To investigate ablation pressure scaling up to 2 x 10^14 W/cm^2.
- To validate analytical models under specific experimental conditions.
Main Methods:
- Utilized stepped aluminum (Al) targets for diagnostics.
- Employed large focal spots and smoothed laser beams to mitigate unwanted effects.
- Measured ablation pressure by detecting shock breakout times from the targets.
Main Results:
- Successfully measured ablation pressure at laser irradiances up to 2 x 10^14 W/cm^2.
- Minimized lateral energy transport and drilling effects through optimized laser and target configurations.
- Observed a good agreement between experimental data and established analytical models.
Conclusions:
- The experimental method provides reliable ablation pressure measurements.
- Analytical models are validated for the investigated laser irradiance range.
- This work contributes to a better understanding of laser-driven material ablation.