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Related Experiment Videos

Quasi-supercontinuum source in the extreme ultraviolet using multiple frequency combs from high-harmonic generation.

Martin Wünsche, Silvio Fuchs, Stefan Aull

    Optics Express
    |April 7, 2017
    PubMed
    Summary

    Researchers developed a quasi-supercontinuum extreme ultraviolet (XUV) source using femtosecond lasers and optical parametric amplifiers for high-harmonic generation. This novel XUV source provides a broad spectrum for advanced spectroscopic applications.

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    Area of Science:

    • Physics
    • Laser Science
    • Quantum Optics

    Background:

    • High-harmonic generation (HHG) typically produces discrete spectra (combs) of odd multiples of the fundamental frequency.
    • Generating a quasi-continuous spectrum in the extreme ultraviolet (XUV) range has been a significant challenge.

    Purpose of the Study:

    • To demonstrate a quasi-supercontinuum XUV source using a table-top laser system.
    • To achieve a broad spectral range (30-200 eV) suitable for advanced applications.

    Main Methods:

    • Utilized a femtosecond laser coupled with a tunable optical parametric amplifier (OPA) to drive HHG.
    • Averaged multiple harmonic comb spectra by automatically sweeping the driving laser wavelength.
    • Generated harmonic radiation from near-infrared (NIR) laser pulses.

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    Main Results:

    • Achieved a quasi-continuous XUV spectrum spanning 30 to 100 eV.
    • Obtained a photon flux of 4×109 photons/s (30-100 eV) and 1×107 photons/s (100-200 eV).
    • Demonstrated the feasibility of averaging spectral combs to create a broadband source.

    Conclusions:

    • The developed quasi-supercontinuum XUV source offers a viable alternative to traditional discrete harmonic spectra.
    • The source's high photon flux and broad spectrum make it suitable for applications like XUV coherence tomography (XCT) and NEXAFS spectroscopy.