Closed loop performance of a layer-oriented multi-conjugate adaptive optics system

Diolaiti, Emiliano; Ragazzoni, Roberto; Tordi, Massimiliano

doi:10.1051/0004-6361:20010514

Cited by 34 publications

(17 citation statements)

References 16 publications

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“…New techniques could be proposed in the future by passing the limitation imposed by the number of DMs. For example, alternative solutions such as the layer oriented MCAO (Ragazzoni et al 2000b; (Diolaiti et al 2001) and hopeful but the sky coverage obtained with only NGSs has not yet been calculated in this case. Unfortunately, it seems that the problem of the large number of DMs necessary to correct a large FOV has still to be solved.…”

Section: Cmentioning

confidence: 99%

First evidence of the finite horizontal extent of the optical turbulence layers. Implications for new adaptive optics techniques

Masciadri

Ávila

Sánchez

2002

A&A

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profiles measured (almost simultaneously) by a GS along different lines of sight. The results of this study show that (1) the horizontal size of the turbulent layers can be finite, (2) the simulations and the measurements are well correlated and (3) for the first time, we show that the model can reproduce observed seeing values that vary as much as 0.50 during the same night. This definitely shows that the numerical simulations are a useful tool in the context of the turbulence characterization for astronomical applications. Finally, we discuss the implications that a finite horizontal size of the turbulent layers could have on new adaptive optics techniques, particularly in applications to the extremely large size telescopes.

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Section: Cmentioning

confidence: 99%

First evidence of the finite horizontal extent of the optical turbulence layers. Implications for new adaptive optics techniques

Masciadri

Ávila

Sánchez

2002

A&A

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“…It is highly estimated that a better performance should be achievable with an additional DM used to correct the high-altitude turbulence, which can be immediately realized by the proposed PT-MCAO. As discussed by Diolaiti et al, 3 this layer-oriented GLAO system is a linear reconstruction and its achieved correction is optimal according to the same criterion with that of the star-oriented approach. In fact, in a converging closed loop system with a sufficiently high correction bandwidth, good correction can be achieved within a few iterations.…”

Section: Discussionmentioning

confidence: 99%

“…Two different MCAO systems were proposed until now: star-oriented 1 and layer-oriented 2 approaches. Diolaiti et al 3 showed that when the FOV is discretized according to the directions of guide stars (GSs), the layeroriented and the star-oriented correction have equivalent performances.…”

Section: Introductionmentioning

confidence: 99%

Pupil-transformation multiconjugate adaptive optics for solar high-resolution imaging

et al. 2016

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Abstract. We propose a multiconjugate adaptive optics (MCAO) system called pupil-transformation MCAO (PT-MCAO) for solar high-angular resolution imaging over a large field of view. The PT-MCAO, consisting of two deformable mirrors (DMs), uses a Shack-Hartmann wavefront sensor located on the telescope pupil to measure the wavefront slopes from several guide stars. The average slopes are used to control the first DM conjugated on the telescope aperture by a solar ground-layer adaptive optics (AO) approach while the remaining slopes are used to control the second DM conjugated on a high altitude by a conventional solar AO via a geometric PT. The PT-MCAO uses a similar hardware configuration as the conventional star-oriented MCAO. However, a distinctive feature of our PT-MCAO is that it avoids the construction of tomography wavefront, which is a time-consuming and complex process for the solar real-time atmospheric turbulence correction. For the PT-MCAO, current widely used and fully understood conventional solar AO closed-loop control algorithms can be directly used to control the two DMs, which greatly reduces the real-time calculation power requirement and makes the PT-MCAO easy to implement. In this publication, we discuss the PT-MCAO methodology, its unique features, and compare its performance with that of the conventional solar star-oriented MCAO systems, which demonstrate that the PT-MCAO can be immediately used for solar high-resolution imaging.

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“…This is true for both the layer oriented and star oriented approaches. Any mis-placement in altitude of the DM, and in the layer oriented case, also of the sensors, smoothes out the spatial frequencies of the higher orders as shown by [13] or [14]. We are conducting SCIDAR measurements at Mt.…”

Section: Altitude Conjugationmentioning

confidence: 99%

LINC-NIRVANA: MCAO toward Extremely Large Telescopes

Gäessler

Arcidiacono

Egner

et al. 2005

Comptes Rendus. Physique

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Closed loop performance of a layer-oriented multi-conjugate adaptive optics system

Cited by 34 publications

References 16 publications

First evidence of the finite horizontal extent of the optical turbulence layers. Implications for new adaptive optics techniques

First evidence of the finite horizontal extent of the optical turbulence layers. Implications for new adaptive optics techniques

Pupil-transformation multiconjugate adaptive optics for solar high-resolution imaging

LINC-NIRVANA: MCAO toward Extremely Large Telescopes

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