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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Infrared hyperspectral upconversion imaging using spatial object translation.

Louis Martinus Kehlet, Nicolai Sanders, Peter Tidemand-Lichtenberg

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    This study demonstrates mid-infrared hyperspectral imaging by converting infrared light to near-infrared for detection. This nonlinear frequency upconversion technique enables detailed spatial and spectral analysis of materials.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Materials Science

    Background:

    • Mid-infrared (MIR) hyperspectral imaging offers rich chemical information but faces detection challenges.
    • Traditional MIR detectors are often expensive, slow, or require cryogenic cooling.
    • Nonlinear frequency conversion presents a viable alternative for MIR detection.

    Purpose of the Study:

    • To develop and demonstrate a system for mid-infrared hyperspectral imaging using nonlinear frequency upconversion.
    • To enable detection of MIR light using a standard silicon-based CCD camera.
    • To characterize the spatial and spectral performance of the developed imaging system.

    Main Methods:

    • Utilized nonlinear frequency upconversion to shift MIR light to the near-infrared (NIR) region.
    • Employed motorized actuators for precise object translation and image acquisition on a grid.
    • Post-processed image sequences to generate monochromatic images within a specific wavelength range.
    • Used a standard USAF resolution target for spatial resolution assessment.
    • Employed a polystyrene film to evaluate spectral information retrieval.

    Main Results:

    • Successfully realized hyperspectral imaging in the MIR wavelength region.
    • Demonstrated the conversion of MIR light to NIR for detection with a Si-based CCD camera.
    • Obtained monochromatic images with wavelength selectivity governed by phase-matching conditions and numerical aperture.
    • Quantified spatial resolution using a USAF target and spectral information using a polystyrene film.

    Conclusions:

    • Nonlinear frequency upconversion is an effective method for enabling MIR hyperspectral imaging with standard NIR detectors.
    • The developed system provides a cost-effective and versatile platform for MIR spectral-spatial analysis.
    • Further optimization of the upconversion system can enhance sensitivity and spectral resolution for advanced applications.