A 30 meter cassegrain telescope with spherical optics and a 3° field

J. H. Burge, J. R.P. Angel

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations


We present a concept is for a fully steerable, quasi-Cassegrain telescope in which the 36 m primary and secondary mirrors are parts of concentric spheres. The 15-m secondary, supported 36 meters above the primary yields a 3°, Cassegrain focal surface, 7 meters in diameter. Though the spherical aberration is large (about 2 arcminutes), many small fields are fully corrected locally. Multiple small units are placed in the focal surface at regions of interest to correct a field of view of a few arcseconds. These can be used for integral field spectroscopy of for direct imaging using adaptive optics. Hundreds of these units could be placed on the focal surface during the day to allow all-night exposures of the desired regions. We believe that this design offers an economical system that can be dedicated for several important types of astronomical observation.

Original languageEnglish (US)
Pages (from-to)574-582
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2002
EventFuture Giant Telescopes - Waikoloa, HI, United States
Duration: Aug 26 2002Aug 28 2002


  • Astronomical optics
  • Optical design
  • Telescope

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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