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    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics
    • Terahertz Science and Technology

    Background:

    • High-field terahertz (THz) sources are crucial for exploring nonlinear phenomena.
    • Existing THz generation methods often require complex setups or lack sufficient field strength.
    • Gallium phosphide (GaP) is a promising material for optical rectification due to its nonlinear properties.

    Purpose of the Study:

    • To demonstrate a table-top, high-field THz source.
    • To achieve peak THz fields exceeding 300 kV/cm.
    • To enable access to new THz coherent control and nonlinear phenomena above 2 THz.

    Main Methods:

    • Optical rectification of a collimated near-infrared (NIR) pulse in a gallium phosphide (GaP) crystal.
    • Implementation of tilted-pulse-front phase matching using a phase grating etched onto the GaP surface.
    • Characterization of THz peak fields and spectral properties.

    Main Results:

    • Generated peak THz fields exceeding 300 kV/cm with a spectrum centered at 2.6 THz.
    • Observed saturation onset of THz generation efficiency at 0.57 mJ NIR pulse energy.
    • Projected potential for THz peak fields up to 866 kV/cm with a 5 mJ NIR pulse.

    Conclusions:

    • The developed table-top THz source offers a practical approach to generating high-field THz radiation.
    • The experimental configuration demonstrates efficient THz generation in GaP via tilted-pulse-front phase matching.
    • This technology opens avenues for advanced studies in THz-driven nonlinear optics and quantum control.