Multiple mirror telescope as a phased array telescope

E. Keith Hege, J. M. Beckers, Peter A Strittmatter, Donald W Mccarthy

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

By adjusting the optical path lengths of its individual beams, it is possible to make the multiple mirror telescope (MMT) into a phased array with a 6.86-m base line. A coherent phased focus can be achieved with tilted focal planes if the tilt angle is chosen so that the internal phase differences exactly compensate the external phase differences. This amounts to a slight change in configuration so that the beams are brought together at //8.39 rather than the originally designed //9. We summarize experiments which have used the MMT subapertures as a phased array and as a coherent phased telescope and present a simple analysis of the titled focal plane geometry for coherent observation. The phased operation of the MMT is important not only for obtaining high angular resolution but also for obtaining the higher detection sensitivity which results from the better discrimination against the sky emission background for IR diffraction-limited images. Full-aperture (six-beam) diffraction-limited results for the unresolved source Gama Orionis, the well- known close binary Capella, and the resolved red supergiant Betelgeuse (including a diffraction-limited differential speckle image of the latter) are presented as preliminary demonstration of the potential capabilities of this configuration.

Original languageEnglish (US)
Pages (from-to)2565-2576
Number of pages12
JournalApplied Optics
Volume24
Issue number16
DOIs
StatePublished - Aug 15 1985

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Antenna phased arrays
phased arrays
Telescopes
Mirrors
telescopes
mirrors
Diffraction
diffraction
Speckle
configurations
angular resolution
optical paths
discrimination
sky
Demonstrations
apertures
adjusting
Geometry
high resolution
geometry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Multiple mirror telescope as a phased array telescope. / Keith Hege, E.; Beckers, J. M.; Strittmatter, Peter A; Mccarthy, Donald W.

In: Applied Optics, Vol. 24, No. 16, 15.08.1985, p. 2565-2576.

Research output: Contribution to journalArticle

Keith Hege, E. ; Beckers, J. M. ; Strittmatter, Peter A ; Mccarthy, Donald W. / Multiple mirror telescope as a phased array telescope. In: Applied Optics. 1985 ; Vol. 24, No. 16. pp. 2565-2576.
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