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

Cold optical design for the Large Aperture Simons Observatory telescope