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Interferometric spatial mode analyzer with a bucket detector.

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    Researchers developed a spatial mode analyzer using a Michelson interferometer and fractional Fourier transform (fFT). This device measures Hermite-Gaussian (HG) mode weights in optical fields, demonstrating its capability for analyzing complex light patterns.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Wavefront Sensing

    Background:

    • Characterizing the spatial modes of optical fields is crucial for various applications, including optical communications and laser beam shaping.
    • Traditional methods for spatial mode analysis can be complex and time-consuming, necessitating the development of more efficient techniques.
    • The Hermite-Gaussian (HG) basis provides a complete set of orthogonal modes for describing paraxial beams.

    Purpose of the Study:

    • To experimentally implement a novel spatial mode analyzer.
    • To utilize an optical fractional Fourier transform (fFT) for efficient mode analysis.
    • To measure modal weights of input fields in the Hermite-Gaussian (HG) mode basis.

    Main Methods:

    • A Michelson interferometer configuration was employed as the core of the spatial mode analyzer.
    • An optical implementation of the fractional Fourier transform (fFT) was integrated into the interferometer's delay line.
    • A bucket detector was used for experimental measurements of modal weights for 1D and 2D input fields.

    Main Results:

    • The experimental setup successfully implemented a spatial mode analyzer.
    • Modal weights for both 1D and 2D input fields were accurately measured.
    • The analyzer demonstrated its capability to analyze fields composed of multiple HG modes.

    Conclusions:

    • The developed Michelson interferometer-based spatial mode analyzer, incorporating an optical fFT, is a viable tool for characterizing optical fields.
    • The system provides an efficient method for determining the contribution of different Hermite-Gaussian modes in complex light beams.
    • This technique offers a practical approach for spatial mode analysis in various optical research and development contexts.