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Piston and tilt interferometry for segmented wavefront sensing.

M Deprez, C Bellanger, L Lombard

    Optics Letters
    |March 16, 2016
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new interferometric method to measure wavefront phase differences and tilts in segmented systems. This technique enables precise co-phasing for telescopes and laser beam combining, even with atmospheric turbulence.

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    Area of Science:

    • Optics and Photonics
    • Astronomy Instrumentation
    • Laser Physics

    Background:

    • Segmented optics, like those in Keck-telescopes, require precise alignment for optimal performance.
    • Coherent laser beam combining is crucial for high-power laser systems.
    • Measuring wavefront aberrations like piston and tilt is essential for adaptive optics and optical system alignment.

    Purpose of the Study:

    • To introduce a novel interferometric technique for measuring relative phase differences (pistons) and tilts of segmented wavefronts.
    • To demonstrate the technique's applicability to co-phasing segmented mirrors in astronomical telescopes and coherent laser beam combining.
    • To provide a simple, fast, and robust method for wavefront metrology.

    Main Methods:

    • Utilizes a simple setup with a holes mask, a diffracting component, and a camera.
    • Analyzes interferograms composed of sinusoidal fringe patterns in multiple subareas.
    • Extracts piston information from fringe shifts and tilt information from fringe frequency and orientation.
    • Employs a two-wavelength measurement to resolve ambiguities.

    Main Results:

    • The technique allows for kilohertz operation rates due to simple pattern analysis.
    • It is compatible with a very high number of segmented elements.
    • The method is robust and can operate effectively in the presence of atmospheric turbulence.

    Conclusions:

    • This novel interferometric technique offers a simple, efficient, and accurate solution for measuring wavefront aberrations in segmented optical systems.
    • It has significant potential for applications in large-scale telescopes and advanced laser systems.
    • The technique's ability to handle atmospheric turbulence and a large number of elements makes it highly versatile.