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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Laser Physics

    Background:

    • Optical Parametric Amplifiers (OPAs) are crucial for generating tunable light.
    • Conventional OPAs typically operate with spectrally separated pump and signal waves.
    • Sub-terahertz (sub-THz) wave generation faces limitations in existing technologies.

    Purpose of the Study:

    • To investigate a novel OPA regime with spectrally close pump and signal waves.
    • To explore the generation of sub-THz idler waves in this regime.
    • To understand the underlying nonlinear processes and their potential applications.

    Main Methods:

    • Numerical simulations were employed to model the nonlinear optical processes.
    • Analysis focused on a regime where pump and signal waves are separated by a few hundred GHz.
    • Investigated simultaneous three-wave mixing and spectral cascading effects.

    Main Results:

    • Observed OPA behavior significantly different from conventional systems.
    • Identified simultaneous three-wave mixing leading to spectral cascading.
    • Demonstrated generation of a sub-THz idler wave.

    Conclusions:

    • Cascaded optical parametric amplification provides a new pathway for THz-wave generation.
    • This method surpasses the conventional Manly-Rowe limit for parametric processes.
    • Enables the creation of high-energy, sparse frequency combs in the THz range.