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Absolute gas density profiling in high-order harmonic generation.

A Comby, S Beaulieu, E Constant

    Optics Express
    |March 14, 2018
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new method to measure gas jet density for high-order harmonic generation. This technique optimizes laser-plasma interactions, enabling absorption-limited harmonic production.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Plasma Physics
    • Laser Science

    Background:

    • High-order harmonic generation (HHG) is a crucial process for producing extreme ultraviolet (XUV) and soft X-ray radiation.
    • Accurate characterization of the gas target is essential for optimizing HHG efficiency and understanding the underlying physics.
    • Previous methods for gas density profiling often lack precision or are difficult to implement in experimental setups.

    Purpose of the Study:

    • To introduce and validate a novel method for determining the absolute density profile of a gas jet used in high-order harmonic generation.
    • To demonstrate the application of this technique for optimizing HHG parameters.
    • To investigate the conditions leading to absorption-limited HHG.

    Main Methods:

    • Utilizing the transverse profile of plasma fluorescence emitted from the gas jet.
    • Developing a measurement protocol to correlate fluorescence intensity with local gas density.
    • Implementing the technique during the optimization of HHG using specific laser parameters (515 nm, 10 µJ, 130 fs pulses at 500 kHz).

    Main Results:

    • Successfully retrieved the absolute local density profile of the gas jet.
    • Demonstrated the capability to optimize HHG by controlling the gas density profile.
    • Identified conditions for generating high-order harmonics in absorption-limited regimes.

    Conclusions:

    • The proposed fluorescence-based method provides an accurate and practical approach for gas jet density characterization.
    • Precise control over gas density profiles is critical for maximizing HHG efficiency and achieving desired harmonic properties.
    • The findings contribute to a deeper understanding and improved control of laser-matter interactions for XUV/soft X-ray generation.