Cold optical design for the large aperture Simons' Observatory telescope

S. R. Dicker, P. A. Gallardo, J. E. Gudmudsson, P. D. Mauskopf, A. Ali, P. C. Ashton, G. Coppi, M. J. Devlin, N. Galitzki, S. P. Ho, C. A. Hill, J. Hubmayr, B. Keating, A. T. Lee, M. Limon, F. Matsuda, J. McMahon, M. D. Niemack, J. L. Orlowski-Scherer, L. PiccirilloM. Salatino, S. M. Simon, S. T. Staggs, R. Thornton, J. N. Ullom, E. M. Vavagiakis, E. J. Wollack, Z. Xu, N. Zhu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Scopus citations


The Simons Observatory will consist of a single large (6 m diameter) telescope and a number of smaller (∼0.5 m diameter) refracting telescopes designed to measure the polarization of the Cosmic Microwave Background to unprecedented accuracy. The large aperture telescope is the same design as the CCAT-prime telescope, a modified Crossed Dragone design with a field-of-view of over 7.8 degrees diameter at 90 GHz. This paper presents an overview of the cold reimaging optics for this telescope and what drove our choice of 350-400 mm diameter silicon lenses in a 2.4 m cryostat over other possibilities. We will also consider the future expandability of this design to CMB Stage-4 and beyond.

Original languageEnglish (US)
Title of host publicationGround-Based and Airborne Telescopes VII
EditorsHeather K. Marshall, Jason Spyromilio
ISBN (Electronic)9781510619531
StatePublished - 2018
EventGround-Based and Airborne Telescopes VII 2018 - Austin, United States
Duration: Jun 10 2018Jun 15 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherGround-Based and Airborne Telescopes VII 2018
Country/TerritoryUnited States

All Science Journal Classification (ASJC) codes

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


  • Crossed Dragone
  • Simons Observatory
  • cryogenic optical design
  • silicon lenses


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