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Fiber-coupled balanced optical cross-correlator using PPKTP waveguides.

Patrick T Callahan, Kemal Safak, Philip Battle

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    Summary
    This summary is machine-generated.

    We developed a compact fiber-coupled optical cross-correlator using periodically-poled KTiOPO(4) waveguides. This device achieves a 20x efficiency improvement over bulk optics, paving the way for enhanced optical sensing applications.

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    Area of Science:

    • Nonlinear optics
    • Integrated photonics
    • Materials science

    Background:

    • Optical cross-correlators are essential for measuring ultrashort laser pulses.
    • Existing bulk-optic devices are bulky and sensitive to environmental changes.
    • Waveguide-based devices offer miniaturization and improved stability.

    Purpose of the Study:

    • To demonstrate a fiber-coupled balanced optical cross-correlator using periodically-poled KTiOPO(4) (PPKTP) waveguides.
    • To characterize the device's performance, including conversion efficiency and sensitivity.
    • To compare the waveguide device with traditional bulk-optic systems.

    Main Methods:

    • Fabrication of PPKTP waveguides.
    • Characterization of normalized conversion efficiency.
    • Measurement of device sensitivity.

    Main Results:

    • Achieved a normalized conversion efficiency of η(0) = 1.02% / [W · cm(2)].
    • Demonstrated a 20-fold improvement in efficiency compared to bulk-optic devices.
    • Sensitivity comparable to free-space bulk-optic cross-correlators.

    Conclusions:

    • The waveguide-based optical cross-correlator offers significant advantages in efficiency and miniaturization.
    • The device shows potential for further performance enhancements.
    • This technology can advance optical sensing and measurement capabilities.