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Continuous tunable cavity Fabry-Perot interferometer by using potassium dideuterium phosphate with two ring

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    We developed a tunable cavity Fabry-Perot interferometer (FPI) using electro-optic DKDP crystals for hyperspectral remote sensing. This device eliminates moving parts, enabling precise spectral measurements for applications like lidar.

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    Area of Science:

    • Optics and Photonics
    • Remote Sensing Technology
    • Materials Science

    Background:

    • Hyperspectral remote sensing requires precise spectral resolution.
    • Traditional tunable interferometers often rely on mechanical components, limiting stability and speed.
    • Electro-optic materials offer a promising avenue for non-mechanical tuning.

    Purpose of the Study:

    • To present a novel continuous tunable cavity Fabry-Perot interferometer (FPI).
    • To utilize potassium dideuterium phosphate (DKDP) for electro-optic tuning in the FPI.
    • To demonstrate the FPI's application in high-spectral-resolution lidar systems.

    Main Methods:

    • Fabrication of an FPI using DKDP crystals with ring electrodes.
    • Employing digital holographic interferometry (Mach-Zehnder based) to measure DKDP refractive index modulation.
    • Characterizing FPI parameters using frequency locking and temperature control.

    Main Results:

    • Achieved a continuous tunable cavity FPI with a 200 MHz full width at half-maximum (FWHM).
    • Demonstrated a free spectral range (FSR) of 11.12 GHz.
    • Validated FPI performance with a temperature-measuring lidar system, showing good agreement with design parameters.

    Conclusions:

    • The DKDP-based tunable FPI offers a robust, non-mechanical solution for hyperspectral sensing.
    • The developed FPI meets the stringent requirements for high-spectral-resolution lidar.
    • This technology advances tunable optical filters for advanced remote sensing applications.