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.
|Title of host publication||Ground-Based and Airborne Telescopes VII|
|Editors||Heather K. Marshall, Jason Spyromilio|
|Publication status||Published - 2018|
|Event||Ground-Based and Airborne Telescopes VII 2018 - Austin, United States|
Duration: 10 Jun 2018 → 15 Jun 2018
|Name||Proceedings of SPIE - The International Society for Optical Engineering|
|Conference||Ground-Based and Airborne Telescopes VII 2018|
|Period||10/06/18 → 15/06/18|
Bibliographical noteFunding Information:
Acknowledgements: CCAT-prime funding has been provided by Cornell University, the Fred M. Young Jr. Charitable Fund, the German Research Foundation (DFG) through grant number INST 216/733-1 FUGG, the Univ. of Cologne, the Univ. of Bonn, and the Canadian Atacama Telescope Consortium. Part of this work was supported by a grant from the Simons Foundation (Award #457687, B.K.). MDN acknowledges support from NSF award AST-1454881. RD thanks CONICYT for grants PIA Anillo ACT-1417 and QUIMAL 160009.
© 2018 SPIE.
- coma correction
- optical design
- telescope optics