A visible MCAO channel for NIRVANA at the LBT

Ragazzoni, Roberto; Herbst, Tom; Gäessler, Wolfgang; Andersen, David R.; Arcidiacono, Carmelo; Baruffolo, A.; Baumeister, Harald; Bizenberger, Peter; Diolaiti, Emiliano; Esposito, Simone; Farinato, Jacopo; Rix, H. W.; Rohloff, Ralf-Rainer; Riccardi, Armando; Salinari, Piero; Soci, Roberto; Vernet-Viard, Elise; Xu, Wei

doi:10.1117/12.459033

Cited by 21 publications

(16 citation statements)

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“…The two efforts were combined in 2001, and soon thereafter, the team realized the potential of using the LBT adaptive secondaries, in combination with one or two additional deformable mirrors, to allow multi-conjugated adaptive optics. MCAO not only increases the available field of view, but also in the LINC-NIRVANA "optical co-addition" incarnation, 6 allows much fainter individual guide stars to be used. This has the salutary effect of significantly expanding the observable fraction of sky.…”

Section: Psf Simulated Galaxymentioning

confidence: 99%

The LINC-NIRVANA interferometric imager for the Large Binocular Telescope

et al. 2004

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We describe LINC-NIRVANA, a 1-2.5 micron interferometric imaging instrument for the Large Binocular Telescope. Operating in Fizeau beam combination mode, LINC-NIRVANA will deliver the sensitivity of a 12-meter telescope and the angular resolution of a 23-meter telescope. Unlike traditional interferometers, LINC-NIRVANA will be a true imaging device, with a field of view of ten arcseconds on a single HAWAII-2 detector array.LINC-NIRVANA employs a number of state-of-the-art technologies, including multi-conjugated adaptive optics (MCAO), innovative cooling systems, and complex software for instrument control and data analysis. We report on overall project progress and highlight some unique aspects of LINC-NIRVANA that should be of wider interest to the near-infrared instrument-building community.

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Section: Psf Simulated Galaxymentioning

confidence: 99%

The LINC-NIRVANA interferometric imager for the Large Binocular Telescope

et al. 2004

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“…This is due to the physical dimension of the mounting of the pyramid (also called star enlargers). These values depend on the system, in particular we used numbers taken from an existing project 14 : the minimum separations adopted are 20 arcsec and 30 arcsec respectively for the high and for the ground WFSs. The stars are selected in order to retrieve the brightest as possible asterism considering the limits given and trying to maximize the separation between the references.…”

Section: Sky Coveragementioning

confidence: 99%

Sky coverage for layer-oriented MCAO: a detailed analytical and numerical study

Arcidiacono

Diolaiti

Ragazzoni

et al. 2004

Advancements in Adaptive Optics

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One of the key-point for the future developments of the multiconjugate adaptive optics for the astronomy is the availability of the correction for a large fraction of the sky. The sky coverage represents one of the limits of the existing single reference adaptive optics system. Multiconjugate adaptive optics allows to overcome the limitations due to the small corrected field of view and the Layer Oriented approach, in particular by its Multiple Field of View version, increases the number of possible references using also very faint stars to guide the adaptive systems. In this paper we study the sky coverage problem in the Layer Oriented case, using both numerical and analytical approaches. Taking into account a star catalogue and a star luminosity distribution function we run a lot of numerical simulation sequences using the Layer Oriented Simulation Tool (LOST). Moreover we perform for several cases a detailed optimization procedure and a relative full simulation in order to achieve better performance for the considered system in those particular conditions. In this way we can retrieve a distribution of numerically simulated cases that allows computing the sky coverage with respect to a performance parameter as the Strehl Ratio and to the scientific field size.

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“…The MCAO system planned for the Gemini telescope will employ three DMs and that will be also the case for the Large Binocular Telescopes (Flicker et al 2000;Ragazzoni et al 2002). In the case of future extremely large telescopes it is still not clear if a larger number of DMs will be necessary to ensure atmospheric turbulence correction.…”

Section: A3 Limiting Ronmentioning

confidence: 99%

Signal to noise ratio of layer-oriented measurements for multiconjugate adaptive optics

Bello

Conan

Rousset

et al. 2003

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Abstract. Multiconjugate adaptive optics (MCAO) employing several deformable mirrors conjugated to different altitudes has been proposed in order to extend the size of the corrected field of view. A three dimensional measurement of the turbulent volume is needed in order to collect the information to control the deformable mirrors. Given a set of guide stars in the field of view, this can be done either using star-oriented or layer-oriented techniques. In the star-oriented measurement each wavefront sensor is coupled to a guide star while in layer-oriented techniques, wavefront sensors are coupled to different layers in the atmosphere and each of them collect light from the whole set of guide stars. This type of measurement is more exactly called optical layer-oriented (OPTLO) as the co-addition of light is done optically. The same information can also be obtained by combining, in a numerical way, star-oriented measurements. This hybrid approach is called numerical layeroriented (NUMLO). In order to compare their performance, we present an analytical study of the signal to noise ratio (SNR) in the optical and numerical layer-oriented measurements. Optical layer oriented measurements are shown to be more efficient in the regime of faint flux and a large number of guide stars, while low detector noise allows numerical layer-oriented schemes to be more efficient in terms of SNR.

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A visible MCAO channel for NIRVANA at the LBT

Cited by 21 publications

References 0 publications

The LINC-NIRVANA interferometric imager for the Large Binocular Telescope

The LINC-NIRVANA interferometric imager for the Large Binocular Telescope

Sky coverage for layer-oriented MCAO: a detailed analytical and numerical study

Signal to noise ratio of layer-oriented measurements for multiconjugate adaptive optics

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