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Related Concept Videos

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Related Experiment Video

Updated: Jun 6, 2026

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

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

Published on: August 12, 2013

Bandwidth limitations and dispersion in optical stellar interferometry.

P R Lawson

    Applied Optics
    |November 25, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Stellar interferometer fringe visibility degrades with air delay lines. Sequential measurements at restricted bandwidths enable 95% visibility detection, overcoming longitudinal dispersion effects.

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    The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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    Published on: December 22, 2015

    Area of Science:

    • Astronomy
    • Optical Interferometry

    Background:

    • Stellar interferometers measure fringe visibility.
    • Air delay lines can degrade measurements due to longitudinal dispersion.
    • Simultaneous visible spectrum observations are impractical at short baselines (e.g., 10 m).

    Purpose of the Study:

    • To investigate methods for maintaining fringe visibility in stellar interferometry.
    • To determine conditions for successful measurements despite longitudinal dispersion.
    • To assess the feasibility of sequential wavelength observations.

    Main Methods:

    • Utilizing a stellar interferometer with an air delay line.
    • Performing sequential measurements at different wavelengths.
    • Analyzing fringe visibility amplitude under varying fractional bandwidths and baselines.
    • Calculating the impact of longitudinal dispersion.

    Main Results:

    • Longitudinal dispersion in air delay lines degrades fringe visibility.
    • Simultaneous observations are impracticable at 10 m baselines.
    • Sequential measurements with fractional bandwidths <10% (10 m), <6% (30 m), and <3% (100 m) allow detection of 95% visibility amplitude.

    Conclusions:

    • Compensating for longitudinal dispersion is crucial for stellar interferometry.
    • Sequential wavelength measurements are a viable alternative to simultaneous observations.
    • Bandwidth restrictions are necessary for accurate measurements at different baselines.