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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Highly efficient broadband sum-frequency generation in the visible wavelength range.

Huseyin Cankaya, Anne-Laure Calendron, Haim Suchowski

    Optics Letters
    |July 1, 2014
    PubMed
    Summary

    Researchers achieved over 90% photon conversion efficiency in broadband sum-frequency generation, converting near-infrared light to visible light using a specialized KTP crystal. This efficient process opens new avenues for optical frequency conversion technologies.

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    Area of Science:

    • Nonlinear Optics
    • Quantum Optics
    • Materials Science

    Background:

    • Sum-frequency generation (SFG) is a vital nonlinear optical process for frequency conversion.
    • Efficient broadband SFG is crucial for applications in spectroscopy, imaging, and optical communications.
    • Achieving high photon conversion efficiency in SFG remains a significant challenge.

    Purpose of the Study:

    • To demonstrate highly efficient broadband sum-frequency generation.
    • To convert a wide near-infrared bandwidth to the visible spectrum.
    • To achieve photon conversion efficiencies exceeding 90%.

    Main Methods:

    • Utilized a 20-mm-long aperiodically adiabatically poled potassium titanyl phosphate (KTP) crystal.
    • Employed a strong pump wave at 1030 nm for efficient frequency conversion.
    • Experimentally validated results with analytic predictions and numerical simulations.

    Main Results:

    • Achieved broadband sum-frequency generation with a 140 THz bandwidth.
    • Converted spectral range from 660-990 nm (near-infrared) to 405-500 nm (visible).
    • Confirmed a photon conversion efficiency of 92±0.5% at a pump intensity of 0.94 GW/cm².

    Conclusions:

    • Demonstrated a record high photon conversion efficiency for broadband SFG.
    • The aperiodically poled KTP crystal enables efficient near-infrared to visible light conversion.
    • The experimental findings align well with theoretical models, validating the approach.