A preliminary overview of the multiconjugate adaptive optics module for the E-ELT

Diolaiti, Emiliano; Conan, Jean-Marc; Foppiani, Italo; Lombini, Matteo; Petit, Cyril; Robert, Clélia; Schreiber, Laura; Ciliegi, P.; Marchetti, Enrico; Bellazzini, M.; Busoni, Lorenzo; Esposito, Simone; Fusco, Thierry; Hubin, N.; Quirós-Pacheco, Fernando; Baruffolo, A.; D’Odorico, S.; Farinato, Jacopo; Neichel, Benoît; Ragazzoni, Roberto; Arcidiacono, Carmelo; Biliotti, Valdemaro; Bregoli, Giovanni; Cosentino, Giuseppe; Innocenti, Giancarlo

doi:10.1117/12.789604

Cited by 17 publications

(10 citation statements)

References 12 publications

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“…A detailed analysis and simulation [5] shows that the optimal number of DMs in this case is three. The optical system provides two intermediate pupil images which allow to locate two post focal DMs while the third DM used is the telescope mirror M4 which is deformable and conjugated to the ground.…”

Section: Introductionmentioning

confidence: 99%

MCAO for the E-ELT: preliminary design overview of the MAORY module

Foppiani

Diolaiti²,

Lombini³

et al. 2010

1st AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

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Abstract. MAORY is the Multi-conjugate Adaptive Optics RelaY module for the European Extremely LargeTelescope. It will be located on the Nasmyth platform of the telescope to feed scientific instruments. The module is supposed to re-image one to one the telescope focal plane with diffraction limited optical quality and to provide multi-conjugate adaptive optics correction of the wavefront distortion induced by the atmosphere. The system is based on six laser guide stars for sensing the wavefront distortion and three deformable mirrors for correcting it. A dichroic is used to split the laser light from the light of the scientific and natural guide stars channel. Two output ports, selected by the dichroic orientation, are foreseen: one in a gravity invariant configuration and one in a vertical position to feed large instruments. In this article the current optical and mechanical design are presented together with the thermal analysis.

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Section: Introductionmentioning

confidence: 99%

MCAO for the E-ELT: preliminary design overview of the MAORY module

Foppiani

Diolaiti²,

Lombini³

et al. 2010

1st AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

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“…Laser guide star (LGS) adaptive optics (AO) systems have been either employed [1][2][3] or are planned [4,5] on most ground-based large-aperture astronomical telescopes to overcome the sky coverage limitations of natural guide star (NGS) AO systems. However, because the laser is projected from the ground and scattered back from the sodium layer, it cannot reliably measure the tip/tilt (TT) wavefront aberration caused by atmospheric turbulence or telescope vibration [6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the improvement in sky coverage for multiconjugate adaptive optics systems obtained using minimum variance split tomography

2011

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The scientific utility of laser-guide-star-based multiconjugate adaptive optics systems depends upon high sky coverage. Previously we reported a high-fidelity sky coverage analysis of an ad hoc split tomography control algorithm and a postprocessing simulation technique. In this paper, we present the performance of a newer minimum variance split tomography algorithm, and we show that it brings a median improvement at zenith of 21 nm rms optical path difference error over the ad hoc split tomography control algorithm for our system, the Narrow Field Infrared Adaptive Optics System for the Thirty Meter Telescope. In order to make the comparison, we also validated our previously developed sky coverage postprocessing software using an integrated simulation of both high-(laser guide star) and low-order (natural guide star) loops. A new term in the noise model is also identified that improves the performance of both algorithms by more properly regularizing the reconstructor.

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“…Many systems will utilize multiple mesospheric sodium LGSs in order to implement laser tomography and multiconjugate adaptive optics [1][2][3]. Continuous wave (CW) sodium guide star lasers are planned for these systems, but their use raises some difficulties.…”

Section: Introductionmentioning

confidence: 99%

Impact of laser launch location on the performance of laser tomography and multiconjugate adaptive optics for extremely large telescopes

2010

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Laser tomography and multiconjugate adaptive optics are under development for ground-based extremely large telescopes. Continuous wave sodium guide star lasers are planned for these systems, but their use raises some difficulties due to the extended nature of the beacons generated in the mesosphere and their spatiotemporal variability. We describe a performance analysis on the impact of laser launch telescope (LLT) location for the Thirty Meter Telescope (TMT) multiconjugate adaptive optics system. A semianalytical first-order noise propagation calculation is presented, supplemented by end-to-end Monte Carlo physical optics simulations. The principal conclusion of the study is that modestly superior performance is achieved with multiple LLT locations around the primary mirror, compared to a single central LLT behind the secondary mirror, but the largest value of any of these improvements is of the order of 20 nm rms for the expected wavefront sensor noise levels, suggesting that the final choice of geometry should depend primarily on the cost and complexity of implementation trade-off. This conclusion is also fully supported by the fact that, for the TMT 70 arcsec laser guide star (LGS) asterism, the fratricide effect reduces the performance of the central launch geometry by only a small amount. The reduction ranges from only a few nm rms at zenith to a few tens of nm at a 45°zenith angle in the worst case that the effect cannot be calibrated.

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A preliminary overview of the multiconjugate adaptive optics module for the E-ELT

Cited by 17 publications

References 12 publications

MCAO for the E-ELT: preliminary design overview of the MAORY module

MCAO for the E-ELT: preliminary design overview of the MAORY module

Analysis of the improvement in sky coverage for multiconjugate adaptive optics systems obtained using minimum variance split tomography

Impact of laser launch location on the performance of laser tomography and multiconjugate adaptive optics for extremely large telescopes

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