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

John H. Seldin; Richard G. Paxman; Vassilis G. Zarifis; Larry Benson; Richard E. Stone

doi:10.1117/12.405804

31 October 2000 Closed-loop wavefront sensing for a sparse-aperture multitelescope array using broadband phase diversity

John H. Seldin, Richard G. Paxman, Vassilis G. Zarifis, Larry Benson, Richard E. Stone

Author Affiliations +

Proceedings Volume 4091, Imaging Technology and Telescopes; (2000) https://doi.org/10.1117/12.405804
Event: International Symposium on Optical Science and Technology, 2000, San Diego, CA, United States

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.

Citation Download 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, (31 October 2000); https://doi.org/10.1117/12.405804

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