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Highly selective terahertz optical frequency comb generator.

J Ye, L S Ma, T Daly

    Optics Letters
    |March 1, 1997
    PubMed
    Summary
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    Researchers created a wide optical frequency comb using a resonant electro-optic modulator and a specialized optical cavity. This technique enables efficient generation and extraction of spectrally pure light for advanced optical measurements.

    Area of Science:

    • Photonics
    • Optical Engineering
    • Laser Physics

    Background:

    • Optical frequency combs are crucial for high-precision spectroscopy and metrology.
    • Generating wide-span, spectrally pure combs efficiently remains a significant challenge in optical sciences.

    Purpose of the Study:

    • To develop a novel method for generating a broadband optical frequency comb.
    • To demonstrate efficient output coupling of a specific high-order sideband from the comb generator.

    Main Methods:

    • Utilized a 10.5-GHz resonant electro-optic modulator within a resonant optical cavity.
    • Employed a three-mirror optical resonator with an output coupler as a thin Fabry-Perot cavity (2 THz FSR, 400 finesse).
    • Tuned the filter cavity to resonate with a specific high-order sideband for selective output coupling.

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    Main Results:

    • Successfully generated an optical frequency comb with a spectral span exceeding 3 THz.
    • Achieved efficient output coupling of the desired sideband while maintaining comb generation.
    • Demonstrated heterodyne detection of the spectrally pure output light with a 1 THz frequency offset laser.

    Conclusions:

    • The proposed method provides an effective technique for generating ultra-wideband optical frequency combs.
    • The use of a tunable filter cavity allows for selective extraction of comb lines, enhancing spectral purity.
    • This advancement has implications for high-resolution optical measurements and future photonic technologies.