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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
12:14

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Published on: August 12, 2013

Dispersion compensation in stellar interferometry.

P R Lawson, J Davis

    Applied Optics
    |November 12, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Spectrometers in stellar interferometry suffer from nonlinear wavelength mapping, impacting fringe observation. Longitudinal-dispersion correctors can fix this nonlinearity, improving visibility measurements and fringe tracking for wide spectral bandwidths.

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    Area of Science:

    • Astronomy
    • Optical Engineering

    Background:

    • Long-baseline stellar interferometry utilizes spectrometers to disperse starlight.
    • Spectrometers are crucial for measuring visibility across multiple wavelengths and for fringe tracking.

    Purpose of the Study:

    • To address the nonlinear mapping issue in spectrometers used for stellar interferometry.
    • To improve visibility measurement and fringe tracking performance in the presence of wide spectral bandwidths.

    Main Methods:

    • Investigated the nonlinear mapping from wave number to detector coordinate in spectrometers.
    • Explored the use of longitudinal-dispersion correctors for nonlinearity compensation.

    Main Results:

    • Identified that prisms and gratings exhibit nonlinear mapping, affecting fringe observation.
    • Demonstrated that longitudinal-dispersion correctors can effectively correct this nonlinear mapping.

    Conclusions:

    • Nonlinearity in spectrometers negatively impacts stellar interferometry performance.
    • Longitudinal-dispersion correctors offer a viable solution for correcting spectrometer nonlinearity, enhancing observational capabilities.