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Proceedings Article

Closed-loop wavefront sensing for a sparse-aperture multitelescope array using broadband phase diversity

[+] Author Affiliations
John H. Seldin, Richard G. Paxman

Veridian ERIM International, Inc. (USA)

Vassilis G. Zarifis, Larry Benson, Richard E. Stone

Lockheed Martin Missiles & Space (USA)

Proc. SPIE 4091, Imaging Technology and Telescopes, 48 (October 31, 2000); doi:10.1117/12.405804
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From Conference Volume 4091

  • Imaging Technology and Telescopes
  • James W. Bilbro; James B. Breckinridge; Richard A. Carreras; Stanley R. Czyzak; Mark J. Eckart; Robert D. Fiete; Paul S. Idell
  • San Diego, CA, USA | July 30, 2000

abstract

The Lockheed Martin phased-array telescope developed at the Palo Alto Research Laboratory is a 0.75-m imaging system consisting of 9 separate 90-mm telescopes. One of the technology drivers behind this design is the ability to maintain the phasing of the individual telescopes to sub- wavelength tolerances. We demonstrate here the use of the focal-plane method of phase diversity for maintaining the phased-array alignment. The telescope is designed to operate with white light, so the phase diversity concept is extended to accommodate a broad optical bandwidth. A simulation of white-light phase-diverse wavefront sensing is presented as a demonstration of the robustness of the method with respect to sparse pupil and wavelength sampling. The simulation is validated with laboratory experiments using a point source. Finally, a closed-loop experiment is conducted that demonstrates the ability of phase diversity to sense piston error and maintain the alignment of the phased-array system.

© (2000) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

John H. Seldin ; Richard G. Paxman ; Vassilis G. Zarifis ; Larry Benson and Richard E. Stone
"Closed-loop wavefront sensing for a sparse-aperture multitelescope array using broadband phase diversity", Proc. SPIE 4091, Imaging Technology and Telescopes, 48 (October 31, 2000); doi:10.1117/12.405804; http://dx.doi.org/10.1117/12.405804


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