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Related Experiment Video

Updated: Jan 4, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Milliwatt-class broadband THz source driven by a 112 W, sub-100 fs thin-disk laser.

F Meyer, N Hekmat, T Vogel

    Optics Express
    |November 6, 2019
    PubMed
    Summary

    We developed a novel terahertz (THz) source using optical rectification in GaP, achieving record average power. This breakthrough enhances THz time-domain spectroscopy, offering improved signal-to-noise ratios and faster measurements.

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    Area of Science:

    • Physics
    • Optics
    • Materials Science

    Background:

    • Terahertz (THz) spectroscopy is crucial for material analysis but limited by low signal-to-noise ratios.
    • Existing THz sources often require complex amplification systems, hindering practical applications.

    Purpose of the Study:

    • To demonstrate a high-repetition-rate, single-cycle THz source with high average power.
    • To achieve this using optical rectification in Gallium Phosphide (GaP) without an amplifier.

    Main Methods:

    • Utilized an amplifier-free, nonlinearly compressed mode-locked thin-disk oscillator based on Yb:YAG.
    • Generated 8.4 µJ pulses with 88 fs duration at a 13.4 MHz repetition rate.
    • Employed optical rectification in GaP to generate THz radiation.

    Main Results:

    • Achieved a maximum average THz power of 1.35 mW at a center frequency of 2 THz.
    • The driving pulses had 112 W average power and 80 MW peak power.
    • This represents the highest average power reported for optical rectification in GaP.

    Conclusions:

    • The demonstrated THz source offers significant performance improvements over existing technologies.
    • This high-power THz source is highly suitable for advancing linear THz time-domain spectroscopy.
    • The findings pave the way for more sensitive and efficient THz spectroscopy applications.