BRIGUGLIO PELLEGRINO, RUNA ANTONIORUNA ANTONIOBRIGUGLIO PELLEGRINONeichel, BenoitBenoitNeichelFusco, ThierryThierryFuscoBONAGLIA, MARCOMARCOBONAGLIABUSONI, LORENZOLORENZOBUSONIESPOSITO, SimoneSimoneESPOSITO2021-01-252021-01-252018978151061959397815106196090277-786Xhttp://hdl.handle.net/20.500.12386/29967The paper describes the possible implementation of a calibration source to be installed in the ELT optical train providing a single pass test beam for AO systems calibration. The source could be used by SCAO systems like those of MICADO/MAORY, HARMONI and METIS and to monitor M4 shape and differential pistons. Additional functionalities could be provided in order to use it for LGS based AO systems calibrations like the MCAO system of MAORY/MICADO or the foreseen LTAO system of HARMONI. In this work, we show a straw man optical design for such an on-axis source and describe options to provide off-axis sources to support engineering and commissioning phases of AO systems at the ELT.ELETTRONICOenConference paper10.1117/12.23149632-s2.0-85053563039000452819300042https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10703/2314963/A-calibration-source-for-ELT-AO-systems/10.1117/12.2314963.full2018SPIE10703E..1AEFIS/05 - ASTRONOMIA E ASTROFISICA