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Miniaturized cost-effective broadband spectrometer employing a deconvolution reconstruction algorithm for resolution

Artem Shcheglov, Yunfeng Nie, Colas Schretter

    Optics Express
    |April 27, 2022
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    Summary

    We developed a compact spectrometer using an opto-digital co-design and a reconstruction algorithm. This approach enhances spectral resolution, achieving sub-nanometer precision for advanced optical sensing applications.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Digital Signal Processing

    Background:

    • Miniaturized spectrometers are crucial for portable and cost-effective spectral analysis.
    • Achieving high spectral resolution in compact devices often involves trade-offs with optical aberrations.
    • Digital algorithms offer a pathway to overcome optical limitations and enhance performance.

    Purpose of the Study:

    • To demonstrate a miniaturized broadband spectrometer with enhanced spectral resolution.
    • To implement an opto-digital co-design strategy for aberration correction.
    • To validate the effectiveness of a reconstruction algorithm for resolution enhancement.

    Main Methods:

    • Developed a miniaturized optical system with controlled residual aberrations.
    • Employed an opto-digital co-design approach, integrating optical design with digital correction.
    • Utilized a reconstruction algorithm to enhance the spectrometer's optical resolution.
    • Performed tolerance analysis to ensure cost-efficient, commercially viable component selection.

    Main Results:

    • Achieved an initial optical resolution of <1.7 nm (VIS) and <3.4 nm (NIR) with the optical design.
    • Built a prototype spectrometer with dimensions of 37x30x26 mm³.
    • Further improved resolution to <1.3 nm (VIS) and <2.3 nm (NIR) using the restoration algorithm.

    Conclusions:

    • The opto-digital co-design approach effectively enhances spectral resolution in miniaturized spectrometers.
    • The developed reconstruction algorithm significantly improves optical resolution beyond the inherent capabilities of the optical system.
    • This cost-efficient, compact spectrometer design has potential for various advanced sensing applications.