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High-resolution, broadband reconstructive spectrometer enabled by cascaded dispersion.

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    This study presents a novel cascading dispersive reconstructive spectrometer (CDRS) for high-resolution, broadband spectral measurements. The CDRS achieves a 20,000 bandwidth-to-resolution ratio, significantly reducing spectral reconstruction errors.

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    Area of Science:

    • Spectroscopy
    • Optical Engineering
    • Photonics

    Background:

    • Synchronous high-resolution and broadband spectral measurement is crucial for many applications.
    • Existing methods face challenges in achieving both high resolution and broad bandwidth simultaneously.

    Purpose of the Study:

    • To introduce a novel spectrometer design for overcoming current limitations in spectral measurement.
    • To demonstrate a significant improvement in bandwidth-to-resolution ratio and accuracy.

    Main Methods:

    • Integration of an acousto-optic tunable filter (AOTF) and a multimode fiber (MMF) in tandem.
    • Utilizing the AOTF for moderate dispersion and MMF for fine dispersion via wavelength-dependent speckles.
    • Development of a cascading dispersive reconstructive spectrometer (CDRS) architecture.

    Main Results:

    • Achieved a bandwidth-to-resolution ratio of 20,000.
    • Demonstrated a spectral resolution of 2 pm over a 40 nm range.
    • Reduced broadband spectral reconstruction errors by one order of magnitude compared to traditional reconstructive spectrometers (RSs).

    Conclusions:

    • The all-fiber CDRS offers a simplified design with wide bandwidth and high resolution.
    • The proposed CDRS is well-suited for diverse spectral measuring scenarios requiring high accuracy.
    • This advancement provides a more effective solution for challenging spectral analysis tasks.