Diffraction-Limited Imaging With The Coherently Cophased Mmt

E. Keith Hege, Donald W. McCarthy, J. C. Hebden

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)20-26
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - Jan 29 1988

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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