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Proceedings Paper

Diffraction-Limited Imaging With The Coherently Cophased Mmt
Author(s): E. Keith Hege; Donald W. McCarthy; J. C. Hebden; Stuart B. Shaklan; Julian C. Christou
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Paper Abstract

The 6.86 m Multiple Mirror Telescope (MMT) has been operated as a coherently cophased interferometric imaging array since 1983. PSF observations at wavelengths from 410 to 850 nm reveal characteristics which must be controlled to achieve reliable imaging at resolutions less than 75 nanoradians (0.015 arc seconds). The MMT has been used to acquire differential speckle images of Alpha Orionis in the H-alpha line and a nearby "continuum" bandpass at 656.9 nm. Broadband images of a 12th magnitude geosynchronous communications satellite, from which shape and size measures have been obtained with 100 nm resolution, give evidence of the capability of the MMT in speckle imaging applications. We have recently extended the cophasing capability to infrared wavelengths by providing reflective pathlength compensation capability.

Paper Details

Date Published: 29 January 1988
PDF: 7 pages
Proc. SPIE 0828, Digital Image Recovery and Synthesis, (29 January 1988); doi: 10.1117/12.942074
Show Author Affiliations
E. Keith Hege, University of Arizona (United States)
Donald W. McCarthy, University of Arizona (United States)
J. C. Hebden, University of Arizona (United States)
Stuart B. Shaklan, National Astronomical Observatories (United States)
Julian C. Christou, National Astronomical Observatories (United States)


Published in SPIE Proceedings Vol. 0828:
Digital Image Recovery and Synthesis
Paul S. Idell, Editor(s)

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