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Intense laser interaction with micro-bars
Michal Elkind1,2, Itamar Cohen1,2, David Blackman3
1The School of Physics and Astronomy, Tel Aviv University, 69978, Tel Aviv, Israel.
Scientific Reports
|December 4, 2023
Summary
Intense laser fields interacting with micrometric gold bars produce two MeV electron jets. These electron bunches maintain their attosecond duration over distance, enabling novel laser-driven light sources.
Area of Science:
- Physics
- Laser-Plasma Physics
- Quantum Electrodynamics
Background:
- Laser-matter interactions differ significantly between flat and rough surfaces.
- Micrometric rough surfaces exhibit high laser energy absorption and emission of energetic particles and radiation.
Purpose of the Study:
- To investigate the interaction of intense laser fields with micrometric gold bars.
- To understand the mechanisms behind electron emission and acceleration in this specific geometry.
- To explore the potential for developing advanced laser-based light sources.
Main Methods:
- Irradiation of isolated, translationally-symmetric micrometric gold bars with intense laser fields.
- Analysis of emitted MeV electrons, ions, and hard X-rays.
- Numerical simulations to model electron dynamics and acceleration.
Main Results:
- Observed emission of two forward-directed electron jets with MeV energies.
- Electrons are accelerated around the object's edge, forming attosecond bunches.
- Simulations confirm electrons remain in-phase with the laser pulse, enabling sustained acceleration.
- Preservation of attosecond bunch duration over large distances in vacuum.
Conclusions:
- The interaction generates highly directional, energy-selective MeV electron jets.
- The observed phenomena offer new pathways for designing compact, high-brightness laser-based light sources.
- Understanding electron dynamics in intense laser fields interacting with microstructures is crucial for future applications.
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