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Updated: Sep 24, 2025
11:20
Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
Published on: July 2, 2012
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Off-harmonic optical probing of high intensity laser plasma expansion dynamics in solid density hydrogen jets
Constantin Bernert1,2, Stefan Assenbaum3,4, Florian-Emanuel Brack3,4
1Helmholtz-Zentrum Dresden-Rossendorf, 01328, Dresden, Germany. c.bernert@hzdr.de.
Scientific Reports
|May 4, 2022
Summary
Precise modeling of laser-plasma accelerators is crucial. Ultra-fast optical diagnostics now provide real-time plasma data, improving simulation accuracy for high-intensity laser-plasma interactions.
Area of Science:
- Plasma Physics
- Laser-Plasma Interactions
- Accelerator Science
Background:
- Relativistic laser-induced plasma processes are non-linear, demanding accurate numerical modeling.
- Predictive simulations for laser-plasma accelerators are limited by incomplete data on plasma states during high-intensity laser interactions.
- Ultra-fast optical diagnostics offer temporally resolved insights into plasma density evolution, addressing these limitations.
Purpose of the Study:
- To implement and demonstrate an off-harmonic optical probe laser setup for investigating high-intensity laser-solid interactions.
- To provide temporally resolved data on plasma density evolution during laser-plasma acceleration.
- To validate and improve numerical simulations of laser-plasma interactions using experimental feedback.
Main Methods:
- Utilized an off-harmonic optical probe laser to study the interaction of a high-intensity laser with a cryogenic hydrogen jet target.
- Implemented precise temporal synchronization between pump and probe lasers.
- Employed spectral filtering and spectrally resolved measurements to mitigate detector saturation from plasma self-emission and capture shadowgraphy data.
Main Results:
- Successfully recorded temporally resolved shadowgraphy data, revealing previously inaccessible details of target ionization and expansion dynamics.
- Observed plasma expansion speeds up to 1.0 x 10^7 m/s.
- Documented full target transparency at 100 ps after the high-intensity laser peak.
Conclusions:
- The developed optical probing technique effectively mitigates detector saturation and provides crucial temporal data.
- Experimental results, including plasma expansion dynamics, were supported by 3D particle-in-cell and ray tracing simulations.
- Time-resolved optical diagnostics are capable of delivering quantitative input for numerical simulations in relativistic laser-plasma interactions.
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