Dicker, S. R.Gallardo, P. A.Gudmundsson, J. EMauskopf, P. D.Ali, A.Ashton, P. C.Coppi, G.Devlin, M. J.Galitzki, N.Ho, S. P.Hill, C. A.Hubmayr, J.Keating, B.Lee, A. T.Limon, M.Matsuda, F.McMahon, J.Niemack, M. D.Orlowski-Scherer, J. L.Piccirillo, L.Salatino, M.Simon, S. M.Staggs, S. T.Thornton, R.Ullom, J. N.Vavagiakis, E. M.Wollack, E. J.Xu, Z.Zhu, N.2025-11-202025-11-202018-08-15Dicker, S R, Gallardo, P A, Gudmundsson, J E, Mauskopf, P D, Ali, A, Ashton, P C, Coppi, G, Devlin, M J, Galitzki, N, Ho, S P, Hill, C A, Hubmayr, J, Keating, B, Lee, A T, Limon, M, Matsuda, F, McMahon, J, Niemack, M D, Orlowski-Scherer, J L, Piccirillo, L, Salatino, M, Simon, S M, Staggs, S T, Thornton, R, Ullom, J N, Vavagiakis, E M, Wollack, E J, Xu, Z & Zhu, N 2018 'Cold optical design for the Large Aperture Simons Observatory telescope'.110605169a1a2457b-2bf9-4daf-81b7-63fef4be6174ArXiv: http://arxiv.org/abs/1808.05058v2https://hdl.handle.net/20.500.11815/7957The 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.7489666eninfo:eu-repo/semantics/restrictedAccessastro-ph.IM/dk/atira/pure/researchoutput/researchoutputtypes/workingpaper/preprint