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Proceedings Paper

Closed-loop wavefront sensing for a sparse-aperture multitelescope array using broadband phase diversity
Author(s): John H. Seldin; Richard G. Paxman; Vassilis G. Zarifis; Larry Benson; Richard E. Stone
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Paper 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.

Paper Details

Date Published: 31 October 2000
PDF: 16 pages
Proc. SPIE 4091, Imaging Technology and Telescopes, (31 October 2000); doi: 10.1117/12.405804
Show Author Affiliations
John H. Seldin, Veridian ERIM International, Inc. (United States)
Richard G. Paxman, Veridian ERIM International, Inc. (United States)
Vassilis G. Zarifis, Lockheed Martin Missiles & Space (United States)
Larry Benson, Lockheed Martin Missiles & Space (United States)
Richard E. Stone, Lockheed Martin Missiles & Space (United States)

Published in SPIE Proceedings Vol. 4091:
Imaging Technology and Telescopes
James W. Bilbro; James B. Breckinridge; Mark J. Eckart; James B. Breckinridge; Richard A. Carreras; Richard A. Carreras; James W. Bilbro; Stanley R. Czyzak; Robert D. Fiete; Mark J. Eckart; Robert D. Fiete; Paul S. Idell, Editor(s)

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