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Wavefront improvement in an injection-seeded soft x-ray laser based on a solid-target plasma amplifier.

Lu Li, Yong Wang, Shoujun Wang

    Optics Letters
    |December 11, 2013
    PubMed
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    Wavefront aberrations in soft x-ray lasers were significantly improved using a molybdenum plasma amplifier. Measurements confirmed high peak brightness and optimized laser performance.

    Area of Science:

    • Plasma Physics
    • Laser Science
    • X-ray Optics

    Background:

    • Injection-seeded soft x-ray lasers are crucial for advanced applications.
    • Characterizing wavefront aberrations is essential for optimizing laser performance.
    • High-harmonic generation provides a source for seeding soft x-ray amplifiers.

    Purpose of the Study:

    • To measure and improve the wavefront quality of an injection-seeded soft x-ray laser.
    • To investigate the impact of plasma column length on wavefront aberrations.
    • To study the temporal dynamics of wavefront characteristics.

    Main Methods:

    • Utilized a Hartmann wavefront sensor for accurate wavefront measurement (λ/32 rms accuracy).
    • Employed a λ=18.9 nm molybdenum plasma amplifier for high-harmonic pulse amplification.

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  • Systematically varied plasma column length and time delay between seed and pump pulses.

    • Main Results:

    • Achieved a significant reduction in wavefront aberrations from 0.51±0.03λ rms to 0.23±0.01λ rms with optimized plasma length.
    • Demonstrated control over wavefront characteristics by adjusting the time delay.
    • Successfully reconstructed the soft x-ray source, confirming its high peak brightness.

    Conclusions:

    • Optimizing plasma column length is critical for minimizing wavefront aberrations in soft x-ray lasers.
    • Precise control over temporal overlap enhances wavefront quality.
    • The developed technique enables high-brightness, high-quality soft x-ray sources.