Conceptual design and performance of the multiconjugate adaptive optics module for the European Extremely Large Telescope
2010
The Multi-conjugate Adaptive Optics RelaY (MAORY) for the European Extremely Large Telescope (E-ELT) provides
a corrected field of view of up to 2 arcmin diameter over the wavelength range 0.8-2.4 μm. It is expected to achieve a
correction of high quality and uniformity with high sky coverage: with a seeing of 0.8 arcsec in the visible, the expected
Strehl Ratio averaged over a 1 arcmin field is approximately 50% at 2.16 μm wavelength over 50% of the sky at the
Galactic Pole. Wavefront correction is obtained by means of the E-ELT adaptive mirrors M4/M5 and of two post-focal
deformable mirrors conjugated at 4km and 12.7km from the telescope pupil. Wavefront sensing is performed by 6
Sodium laser guide stars and by 3 natural guide stars, used to measure atmospheric and windshake tilt and to provide a
reference for the focus and for the low-order aberrations induced by the Sodium layer. MAORY is located on the E-ELT
Nasmyth platform and has a gravity invariant port, feeding the high angular resolution camera MICADO, and a lateral
port for a detached instrument as the infrared spectrograph SIMPLE.
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