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Free-space spectro-temporal and spatio-temporal conversion for pulsed light.

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    We developed a new optical apparatus that converts spectral and temporal information from pulsed light sources. This device enables real-time spectroscopy and imaging by measuring spectral data using a single detector.

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    Area of Science:

    • Optics and Photonics
    • Spectroscopy
    • Quantum Optics

    Background:

    • Traditional spectral measurements can be complex and time-consuming.
    • Existing methods often rely on intricate setups involving fibers or interference.
    • Pulsed light sources present unique challenges for spectral analysis.

    Purpose of the Study:

    • To introduce a novel apparatus for converting spectral to temporal representations of optical information.
    • To enable efficient real-time spectroscopy, imaging, and spectral correlation measurements.
    • To overcome limitations of existing spectral analysis techniques.

    Main Methods:

    • The apparatus utilizes a 2f-cavity-like mirror arrangement for multiple round-trips.
    • Spectral spreading occurs on the back focal plane, with sections extracted after each round-trip.
    • The method avoids the use of optical fibers and interference effects.

    Main Results:

    • The apparatus successfully converts spectral information into a temporal pulse train.
    • A prototype achieved over 10% average efficiency in the near-infrared (NIR) spectrum.
    • Demonstrated efficient measurement of the joint spectrum for a non-degenerate bi-photon source.

    Conclusions:

    • The developed apparatus offers a new, efficient method for spectral-temporal conversion.
    • It provides easy wavelength range tunability and operates without fibers or interference.
    • The technology is suitable for real-time spectral analysis and quantum optics applications.