Optical design of the relay optics for the MICADO SCAO system

We present the current optical design of the Relay Optics (RO) dedicated to the single-conjugate adaptive optics (SCAO) mode for the first light E-ELT imaging camera MICADO. MICADO is a wide-field near-IR camera featuring a 75 arcsec field of view, with spectrographic, astrometric, and coronagraphic capabilities. It has been chosen by ESO as one of the two first-light instruments. MICADO will be optimized for the multi-conjugate adaptive optics module MAORY and will also work in SCAO mode to provide a high-level, on-axis correction (making use of the adaptive secondary M4 in the telescope). For full scientific exploitation and in a phase approach for developing AO performance at the ELT, a SCAO mode is needed for MICADO. It will be a joint development between the MICADO and MAORY consortia and in the long term integrated in MAORY. Different options are presented to accommodate different set of requirements, the development plan of MICADO and MAORY instruments will lead to the final configuration and the used of the SCAO and its RO. They allow Coronagraphic observations providing an intermediate pupil plane to accommodate an atmospheric dispersion corrector and an apodizer.