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Unambiguous phase retrieval as a cophasing sensor for phased array telescopes.

Fabien Baron1, Isabelle Mocoeur, Frédéric Cassaing

  • 1Office National d'Etudes et de Recherches Aérospatiales, Optics Department, Châtillon cedex, France. baron@mrao.cam.ac.uk

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
|May 3, 2008
PubMed
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A single focal-plane image can achieve multiple-aperture optical telescope (MAOT) cophasing. This study validates a new analytic estimator for subaperture aberrations, demonstrating its effectiveness in simulations and experiments.

Area of Science:

  • Optical astronomy
  • Interferometry
  • Adaptive optics

Background:

  • Cophasing multiple-aperture optical telescopes (MAOTs) or optical interferometers necessitates precise knowledge of subaperture tips/tilts and differential pistons.
  • Accurate cophasing is crucial for achieving high-resolution imaging and sensitivity in large telescope arrays.

Purpose of the Study:

  • To demonstrate that a single focal-plane image is sufficient for MAOT cophasing.
  • To develop and validate an analytic estimator for subaperture aberrations.
  • To compare the performance of the analytic estimator with conventional iterative phase retrieval algorithms.

Main Methods:

  • Utilized a least-square approach to derive an analytic estimator for subaperture aberrations.
  • Performed simulations to validate the analytic estimator.

Related Experiment Videos

  • Conducted experimental validation on a laboratory test bench using focal-plane sensors.

    • Main Results:

    • A single focal-plane image was shown to be sufficient for MAOT cophasing.
    • The analytic estimator was validated through simulations and experimental measurements.
    • Subnanometric repeatability was achieved, demonstrating the effectiveness of focal-plane sensors.

    Conclusions:

    • Focal-plane sensors are suitable for the cophasing of phased array telescopes.
    • The developed analytic estimator offers an efficient method for MAOT cophasing, particularly in closed-loop operations.
    • The findings pave the way for improved performance in next-generation optical interferometers.