Towards the phase A review of MAORY, the multi-conjugate adaptive optics module for the E-ELT

Diolaiti, Emiliano; Conan, Jean-Marc; Foppiani, Italo; Lombini, Matteo; Marchetti, Enrico; Petit, Cyril; Robert, Clélia; Schreiber, Laura; Baruffolo, A.; Bellazzini, M.; Bregoli, Giovanni; Ciliegi, P.; Cosentino, Giuseppe; Biliotti, Valdemaro; D’Odorico, S.; Fusco, Thierry; Hubin, N.; Meimon, Serge; Sauvage, Jean-François

doi:10.1051/ao4elt/201002007

Cited by 45 publications

(18 citation statements)

References 7 publications

(6 reference statements)

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“…Many systems will utilize multiple mesospheric sodium LGSs in order to implement laser tomography for ground-layer adaptive optics (GLAO), laser tomography adaptive optics (LTAO), multiobject adaptive optics (MOAO) or multi-conjugate adaptive optics (MCAO) [1][2][3][4][5]. Real-time turbulence profiling is necessary for these wide-field AO systems to tune their tomographic wavefront reconstruction algorithm [6,7] and perform a variety of image post-processing tasks involving point-spread function reconstruction [8].…”

Section: Introductionmentioning

confidence: 99%

Real-time turbulence profiling with a pair of laser guide star Shack–Hartmann wavefront sensors for wide-field adaptive optics systems on large to extremely large telescopes

Gilles

Ellerbroek

2010

J. Opt. Soc. Am. A

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Real-time turbulence profiling is necessary to tune tomographic wavefront reconstruction algorithms for widefield adaptive optics (AO) systems on large to extremely large telescopes, and to perform a variety of image post-processing tasks involving point-spread function reconstruction. This paper describes a computationally efficient and accurate numerical technique inspired by the slope detection and ranging (SLODAR) method to perform this task in real time from properly selected Shack-Hartmann wavefront sensor measurements accumulated over a few hundred frames from a pair of laser guide stars, thus eliminating the need for an additional instrument. The algorithm is introduced, followed by a theoretical influence function analysis illustrating its impulse response to high-resolution turbulence profiles. Finally, its performance is assessed in the context of the Thirty Meter Telescope multi-conjugate adaptive optics system via end-to-end wave optics Monte Carlo simulations.

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Section: Introductionmentioning

confidence: 99%

Real-time turbulence profiling with a pair of laser guide star Shack–Hartmann wavefront sensors for wide-field adaptive optics systems on large to extremely large telescopes

Gilles

Ellerbroek

2010

J. Opt. Soc. Am. A

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“…• [3] [4]. A detailed analysis and simulation [5] shows that the optimal number of DMs in this case is three.…”

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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“…Nevertheless, natural guide stars are still needed to sense low order modes. 1,2 We recently proposed a wavefront sensor called LIFT (Linearized Focal-plane Technique) dedicated to faint natural guide stars. 3 The estimation by LIFT is based upon a single full aperture image taken at the focal plane of the telescope.…”

Section: Introductionmentioning

confidence: 99%

LIFT: analysis of performance in a laser assisted adaptive optics

Plantet¹,

Meimon²,

Conan³

et al. 2014

SPIE Proceedings

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Laser assisted adaptive optics systems rely on Laser Guide Star (LGS) Wave-Front Sensors (WFS) for high order aberration measurements, and rely on Natural Guide Stars (NGS) WFS to complement the measurements on low orders such as tip-tilt and focus. The sky-coverage of the whole system is therefore related to the limiting magnitude of the NGS WFS.We have recently proposed LIFT, a novel phase retrieval WFS technique, that allows a 1 magnitude gain over the usually used 2×2 Shack-Hartmann WFS. After an in-lab validation, LIFT's concept has been demonstrated on sky in open loop on GeMS (the Gemini Multiconjugate adaptive optics System at Gemini South). To complete its validation, LIFT now needs to be operated in closed loop in a laser assisted adaptive optics system.The present work gives a detailed analysis of LIFT's behavior in presence of high order residuals and how to limit aliasing effects on the tip/tilt/focus estimation. Also, we study the high orders' impact on noise propagation. For this purpose, we simulate a multiconjugate adaptive optics loop representative of a GeMS-like 5 LGS configuration. The residual high orders are derived from a Fourier based simulation. We demonstrate that LIFT keeps a high performance gain over the Shack-Hartmann 2×2 whatever the turbulence conditions. Finally, we show the first simulation of a closed loop with LIFT estimating turbulent tip/tilt and focus residuals that could be induced by sodium layer's altitude variations.

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Towards the phase A review of MAORY, the multi-conjugate adaptive optics module for the E-ELT

Abstract: Abstract. MAORY is the multi-conjugate adaptive optics module for the European Extremely Large Telescope.A conceptual design study is in progress and is approaching the final review. A description of the current design and of the expected performance is presented.

Cited by 45 publications

References 7 publications

Real-time turbulence profiling with a pair of laser guide star Shack–Hartmann wavefront sensors for wide-field adaptive optics systems on large to extremely large telescopes

Real-time turbulence profiling with a pair of laser guide star Shack–Hartmann wavefront sensors for wide-field adaptive optics systems on large to extremely large telescopes

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

LIFT: analysis of performance in a laser assisted adaptive optics

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