High resolution imaging at the Multiple Mirror Telescope using adaptive optics

Details High resolution imaging at the Multiple Mirror Telescope using adaptive optics High resolution imaging at the Multiple Mirror Telescope using adaptive optics

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992spie.1688..442l&link_type=abstract

In: Atmospheric propagation and remote sensing; Proceedings of the Meeting, Orlando, FL, Apr. 21-23, 1992 (A93-37102 14-74), p.

Physics

Optics

1

Adaptive Optics, Design Analysis, Image Resolution, Mirrors, Neural Nets, Telescopes, High Resolution, Optical Correction Procedure, Speckle Patterns

Scientific paper

The next generation of 6 to 10 m class telescopes is being planned to include the capability for adaptive wavefront correction. The MMT with its 7-m baseline, provides an ideal testbed for novel techniques of adaptive optics. Using a new instrument based on a six-segment adaptive mirror, a number of wavefront sensing algorithms including an artificial neural network have been implemented to demonstrate the high resolution imaging capability of the telescope. These algorithms rely on a freely available property of starlight, namely, its coherence over large scales, to sense directly atmospheric and instrumental phase errors across large distances. In this paper, we report results obtained so far with resolutions between 0.08 and 0.3 arcsec at 2.2-micron wavelength. We also show data indicating that at the level of 0.1-arcsec imaging in good seeing, the isoplanatic patch at this wavelength is at least 20 arcsec across.

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