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19 January 2025 |
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Article overview
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Optical Probing of Ultrafast Laser-Induced Solid-to-Overdense-Plasma Transitions | | Yasmina Azamoum
; Georg Alexander Becker
; Sebastian Keppler
; Guillaume Duchateau
; Stefan Skupin
; Mickael Grech
; Fabrice Catoire
; Sebastian Hell
; Issa Tamer
; Marco Hornung
; Marco Hellwing
; Alexander Kessler
; Franck Schorcht
; Malte Christoph Kaluza
; | | Date: |
1 Sep 2023 | | Abstract: | Understanding the target dynamics during its interaction with a relativistic
ultrashort laser pulse is a challenging fundamental multi-physics problem
involving at least atomic and solid-state physics, plasma physics, and laser
physics. Already, the properties of the so-called pre-plasma formed as the
laser pulse’s rising edge ionizes the target are complicated to access in
experiments and modeling, and many aspects of this laser-induced transition
from solid to overdense plasma over picosecond time scales are still open
questions. At the same time, applications like laser-driven ion acceleration
require precise knowledge and control of the pre-plasma because the efficiency
of the acceleration process itself crucially depends on the target properties
at the arrival of the relativistic intensity peak of the pulse. By capturing
the dynamics of the initial stage of the interaction, we report on a detailed
visualization of the pre-plasma formation and evolution. Nanometer-thin
diamond-like carbon foils are shown to transition from solid to plasma during
the laser rising edge with intensities < 10^16 W/cm^2. Single-shot
near-infrared probe transmission measurements evidence sub-picosecond dynamics
of an expanding plasma with densities above 10^23 cm^-3 (about 100 times the
critical plasma density). The complementarity of a solid-state interaction
model and a kinetic plasma description provides deep insight into the interplay
of ionization, collisions, and expansion. | | Source: | arXiv, 2309.00303 | | Services: | Forum | Review | PDF | Favorites | |
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