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Related Experiment Video

Updated: Jan 23, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Octave-wide phase-matched four-wave mixing in dispersion-engineered crystalline microresonators.

Shun Fujii, Shuya Tanaka, Mika Fuchida

    Optics Letters
    |June 15, 2019
    PubMed
    Summary

    We achieved octave-spanning four-wave mixing in a microresonator, generating clustered frequency combs. This breakthrough enables tunable comb generation from 1 µm to mid-infrared wavelengths.

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    Area of Science:

    • Nonlinear optics
    • Quantum optics
    • Photonics

    Background:

    • Four-wave mixing (FWM) is a key nonlinear optical process for generating new frequencies.
    • Microresonators offer enhanced light-matter interaction for efficient nonlinear processes.
    • Achieving broadband frequency generation, especially octave-spanning, is crucial for applications like optical frequency combs.

    Purpose of the Study:

    • To demonstrate phase-matched four-wave mixing (FWM) over an octave bandwidth in a dispersion-engineered crystalline microresonator.
    • To investigate the generation of primary and secondary sidebands, leading to clustered frequency combs.
    • To explore the potential for a compact, tunable source of broadband frequency combs.

    Main Methods:

    • Utilizing a dispersion-engineered crystalline microresonator to achieve phase matching for FWM.
    • Experimental generation and characterization of frequency sidebands.
    • Numerical simulations to model the FWM process and validate experimental results.
    • Theoretical analysis of phase-matching conditions.

    Main Results:

    • Successfully generated phase-matched four-wave mixing with primary sidebands shifted up to 140 THz.
    • Observed the formation of secondary sidebands, creating a localized clustered comb structure near primary sidebands.
    • Experimental results were in excellent agreement with theoretical analysis and numerical simulations.

    Conclusions:

    • The study successfully demonstrated octave-spanning FWM in a microresonator, generating clustered frequency combs.
    • The results validate the theoretical understanding of phase-matching in such systems.
    • This work paves the way for compact, tunable frequency comb generators spanning 1 µm to mid-infrared wavelengths.