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The Multiconjugate adaptive Optic Relay For ELT Observations (MORFEO,formerly known as MAORY) is the adaptive optics (AO) module for the ExtremelyLarge Telescope (ELT) aimed at providing a 1 arcmin corrected field to theMulti-AO Imaging CamerA for Deep Observations (MICADO) and to a future clientinstrument. It should provide resolution close to the diffraction limit on alarge portion of the sky and in a wide range of atmospheric conditions. Itsability to provide a flat wavefront must face the known aspect of theatmospheric turbulence and telescope environment, but also the finalcharacteristic of a telescope still to be fully developed and built. In thiswork we focused on issues related to the segmentation of the telescope pupil(like low wind effect, residual phasing error at handover and control relatedissues), that could limit the system performance. MORFEO currently does notforesee a dedicated sensor to measure the phase step between adjacent mirrorsegments: in this work we study the possibility to use the low order wavefrontsensors designed to sense and correct tip-tilt and focus as phasing sensorsthanks to the linearized focal-plane technique (LIFT).

MAORY/MORFEO and LIFT: can the low order wavefront sensors become phasing sensors?