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    This summary is machine-generated.

    We developed a noise-free terahertz-wave system using high-power injection seeding in a parametric generator. This method significantly improves signal quality by separating terahertz signals from broadband noise.

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    Area of Science:

    • Optics and Photonics
    • Quantum Electronics

    Background:

    • Conventional injection-seeded terahertz-wave parametric generators (is-TPGs) suffer from broadband noise due to overlapping spontaneous parametric down-conversion and signal generation.
    • This noise reduces the signal-to-noise ratio (SNR) in the terahertz output.

    Purpose of the Study:

    • To achieve noise-free terahertz-wave output from an is-TPG.
    • To enhance the signal-to-noise ratio of terahertz-wave generation.

    Main Methods:

    • Employed high-power injection seeding, approximately 10^7 times more powerful than conventional continuous-wave (CW) seed beams.
    • Shifted the terahertz signal generation to the front of the crystal.
    • Separated the terahertz signal from broadband noise using the powerful pulsed seed beam.

    Main Results:

    • Successfully achieved noise-free terahertz-wave output.
    • Demonstrated a signal-to-noise ratio of 95 dB.
    • Obtained an improvement of approximately 40 dB compared to conventional systems.

    Conclusions:

    • High-power injection seeding effectively eliminates broadband noise in is-TPGs.
    • This technique significantly enhances the quality and usability of terahertz-wave sources.
    • The developed system offers a substantial improvement for applications requiring high-purity terahertz waves.