Multi-Conjugate Adaptive Optics - relay optical designs for a 4-m off-axis solar telescope

The Sun is an ideal object for the development and application of Multi-Conjugate Adaptive Optics (MCAO). An effort to develop solar MCAO is pursued by the NSO’s Adaptive Optics Project. In developing solar MCAO we bear in mind its possible implementation into the proposed 4-M Advanced Technology Solar Telescope (ATST). Two possible relay optical designs feeding a MCAO section and the Coudé section of a 4-M off-axis solar telescope, such as the proposed ATST, are presented and discussed here.