The optical design of the six-meter CCAT-prime and Simons Observatory telescopes

Stephen C. Parshley; Michael Niemack; Richard Hills; Simon R. Dicker; Rolando Dünner; Jens Erler; Patricio A. Gallardo; Jon E. Gudmundsson; Terry Herter; Brian J. Koopman; Michele Limon; Frederick T. Matsuda; Philip Mauskopf; Dominik A. Riechers; Gordon J. Stacey; Eve M. Vavagiakis

doi:10.1117/12.2314073

6 July 2018 The optical design of the six-meter CCAT-prime and Simons Observatory telescopes

Stephen C. Parshley, Michael Niemack, Richard Hills, Simon R. Dicker, Rolando Dünner, Jens Erler, Patricio A. Gallardo, Jon E. Gudmundsson, Terry Herter, Brian J. Koopman, Michele Limon, Frederick T. Matsuda, Philip Mauskopf, Dominik A. Riechers, Gordon J. Stacey, Eve M. Vavagiakis

Author Affiliations +

Proceedings Volume 10700, Ground-based and Airborne Telescopes VII; 1070041 (2018) https://doi.org/10.1117/12.2314073
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

A common optical design for a coma-corrected, 6-meter aperture, crossed-Dragone telescope has been adopted for the CCAT-prime telescope of CCAT Observatory, Inc., and for the Large Aperture Telescope of the Simons Observatory. Both are to be built in the high altitude Atacama Desert in Chile for submillimeter and millimeter wavelength observations, respectively. The design delivers a high throughput, relatively flat focal plane, with a field of view 7.8 degrees in diameter for 3 mm wavelengths, and the ability to illuminate >100k diffraction-limited beams for < 1 mm wavelengths. The optics consist of offset reflecting primary and secondary surfaces arranged in such a way as to satisfy the Mizuguchi-Dragone criterion, suppressing first-order astigmatism and maintaining high polarization purity. The surface shapes are perturbed from their standard conic forms in order to correct coma aberrations. We discuss the optical design, performance, and tolerancing sensitivity. More information about CCAT-prime can be found at ccatobservatory.org and about Simons Observatory at simonsobservatory.org.

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Stephen C. Parshley, Michael Niemack, Richard Hills, Simon R. Dicker, Rolando Dünner, Jens Erler, Patricio A. Gallardo, Jon E. Gudmundsson, Terry Herter, Brian J. Koopman, Michele Limon, Frederick T. Matsuda, Philip Mauskopf, Dominik A. Riechers, Gordon J. Stacey, and Eve M. Vavagiakis "The optical design of the six-meter CCAT-prime and Simons Observatory telescopes", Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 1070041 (6 July 2018); https://doi.org/10.1117/12.2314073

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