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Bringing the Visible Universe into Focus with Robo-AO
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Published on: February 12, 2013

Eyeglass. 1. Very large aperture diffractive telescopes.

R A Hyde1

  • 1Lawrence Livermore National Laboratory, Mail Stop L-477, 7000 East Avenue, Livermore, California 94550, USA.

Applied Optics
|March 8, 2008
PubMed
Summary

The Eyeglass telescope uses a diffractive lens for a large aperture, enabling launchable, high-precision space observation. Corrective optics overcome bandwidth limitations for versatile spectral imaging.

Area of Science:

  • Astronomy and Astrophysics
  • Optical Engineering
  • Space Technology

Background:

  • Traditional large-aperture space telescopes face significant challenges in launchability and manufacturing tolerances.
  • Reflecting apertures require extremely precise surface shaping, increasing complexity and cost.

Purpose of the Study:

  • To introduce the Eyeglass concept, a novel space telescope design.
  • To address the limitations of existing large-aperture space telescope technologies.
  • To demonstrate a design capable of diffraction-limited imaging across various spectral bands.

Main Methods:

  • Utilizing a transmissive diffractive lens for the primary aperture (25-100m).
  • Employing a separate, smaller spacecraft as a mobile eyepiece.
  • Incorporating corrective optics within the eyepiece to manage spectral bandwidth limitations.

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Main Results:

  • The diffractive lens design is inherently launchable, lightweight, and packagable.
  • Eliminates the need for extremely tight surface shape tolerances common in reflecting optics.
  • Achieves diffraction-limited imaging with single-band, multiband, or continuous spectral coverage.

Conclusions:

  • The Eyeglass design offers a viable solution for constructing very large aperture space telescopes.
  • It overcomes key engineering hurdles associated with large optics in space.
  • Provides a flexible platform for advanced astronomical observations across a wide spectral range.