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Towards subpicosecond pulses from solid target plasma based seeded soft X-ray laser.

Alok Kumar Pandey, Irene Papagiannouli, Fabrice Sanson

    Optics Express
    |October 29, 2020
    PubMed
    Summary
    This summary is machine-generated.

    We studied soft X-ray laser (XRL) coherence under varying electron densities. Efficient lasing was achieved at higher densities, with predicted pulse durations around 500fs for seeded XRLs.

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    Area of Science:

    • Plasma Physics
    • Laser Science
    • Coherence Studies

    Background:

    • Plasma-based soft X-ray lasers (XRLs) are crucial for various scientific applications.
    • Understanding and controlling XRL coherence is essential for optimizing their performance.
    • Electron density variations in the gain region significantly impact XRL properties.

    Purpose of the Study:

    • To investigate the temporal coherence of plasma-based soft X-ray lasers (XRLs).
    • To analyze the effect of altered electron densities on XRL coherence and lasing efficiency.
    • To validate theoretical models with experimental observations of XRLs.

    Main Methods:

    • Measurement of source temporal coherence in amplified spontaneous emission (ASE) mode.
    • Development of a data analysis procedure to extract spectral width and pulse duration.
    • Utilizing a one-dimensional Bloch-Maxwell code for temporal coherence modeling.
    • Experimental demonstration of lasing at elevated electron densities.

    Main Results:

    • Temporal coherence properties were measured and analyzed in ASE mode.
    • Experimental results align with spectral line shape simulations and seeded operation data.
    • Efficient lasing was demonstrated in both ASE and seeded modes at double the routine electron density.
    • Bloch-Maxwell modeling predicted a pulse duration of approximately 500fs for seeded XRLs in the high-density regime.

    Conclusions:

    • The study successfully characterized XRL coherence under varying electron densities.
    • The findings confirm the validity of the Bloch-Maxwell model for predicting XRL temporal coherence.
    • Efficient XRL operation is achievable at higher electron densities, opening new possibilities for applications.