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Pre-plasma formation in experiments using petawatt lasers.

Florian Wagner, Stefan Bedacht, Alex Ortner

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    Amplified spontaneous emission (ASE) above 10^-9 creates a pre-plasma plume, causing laser self-focusing. Lower ASE levels (10^-10) did not produce detectable pre-plasma in solid-target experiments.

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    Area of Science:

    • Plasma Physics
    • Laser-Matter Interaction

    Background:

    • Understanding pre-plasma formation is crucial for laser-target interactions.
    • Amplified spontaneous emission (ASE) can significantly influence plasma dynamics.

    Purpose of the Study:

    • To quantitatively measure plasma density during pre-plasma formation.
    • To investigate the impact of ASE levels on pre-plasma plume development and laser beam self-focusing.

    Main Methods:

    • Utilized time-resolved shadowgraphy for micrometer-scale accuracy.
    • Performed quantitative plasma density measurements.
    • Employed 2D hydrodynamic simulations to support experimental data.

    Main Results:

    • ASE levels above 10^-9 generated a significant pre-plasma plume.
    • Observed a plasma canal within the pre-plasma plume, driving laser self-focusing.
    • No detectable ASE pre-plasma was observed at ASE levels of 10^-10.

    Conclusions:

    • ASE plays a critical role in initiating pre-plasma formation.
    • Threshold ASE levels exist for significant pre-plasma generation and subsequent laser beam manipulation.