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Harmonic generation in solids with direct fiber laser pumping.

Kevin F Lee, Xiaoyan Ding, T J Hammond

    Optics Letters
    |March 16, 2017
    PubMed
    Summary

    Researchers achieved high harmonic generation in solids, producing strong and stable signals in silicon and zinc oxide. This breakthrough could enable attosecond techniques in semiconductors and vacuum ultraviolet spectroscopy.

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    Area of Science:

    • Solid-state physics
    • Attosecond science
    • Nonlinear optics

    Background:

    • High harmonic generation (HHG) is a crucial process for generating short-wavelength light.
    • Extending HHG to solid materials offers potential for compact sources and novel applications.
    • Semiconductors are promising materials for HHG due to their tunable electronic properties.

    Purpose of the Study:

    • To investigate high harmonic generation in semiconductor materials.
    • To explore the potential of solid-state HHG for attosecond science and spectroscopy.
    • To assess the feasibility of using silicon and zinc oxide for efficient harmonic generation.

    Main Methods:

    • Focusing a Tm fiber laser into silicon and zinc oxide crystals.
    • Characterizing the generated high-order harmonics.

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  • Performing theoretical calculations to predict higher harmonic orders.

    • Main Results:

    • Generation of up to the seventh harmonic of the Tm fiber laser.
    • Observed strong and stable harmonic signals without material damage.
    • Calculations indicate potential for generating the nineteenth harmonic (12 eV photons).

    Conclusions:

    • High harmonic generation in solids is feasible and efficient in silicon and zinc oxide.
    • This technique offers a simple source for vacuum ultraviolet frequency comb spectroscopy.
    • Further research can explore higher harmonic orders and other solid materials for advanced applications.