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MAORY (Multi-conjugate Adaptive Optics RelaY) is one of the first light instruments for the  Extremely Large Telescope (ELT), the 39 m diameter optical-infrared telescope that the European Southern Observatory (ESO)  will build in the next decade in collaboration with its community of member States.

MAORY is a post-focal adaptive optics module. It supports the MICADO  near-infrared camera by offering two adaptive optics modes: Multi-Conjugate Adaptive Optics (MCAO) and Single-Conjugate Adaptive Optics (SCAO).

 

 

General overview of the MAORY instrument (thermal cover in transparency) installed on the Nasmyth platform with MICADO

 

In the MCAO mode, wavefront sensing is performed by a system based on up to six Laser Guide Stars for high-order wavefront sensing and three Natural Guide Stars for low-order wavefront sensing; wavefront compensation is achieved by up to two deformable mirrors in MAORY, which work together with the telescope adaptive and tip-tilt mirrors M4 and M5 respectively. In the SCAO mode, wavefront distortions are measured by a single Natural Guide Star wavefront sensor and compensated by the telescope M4 and M5 mirrors, while the deformable mirrors inside MAORY are kept flat.

MAORY also offers provision for a second port for a future instrument, as yet undefined.

The international consortium that will develop MAORY from phase B (preliminary design) to phase E (commissioning) includes INAF (lead institute responsible for the design and construction of the instrument at system level) ,  IPAG (France) and NUIG (Ireland). ESO is the project customer and is also a supplier of components for the instrument construction.