MICADO: first light imager for the E-ELT

Davies, Richard; Schubert, J.; Hartl, Michael; Alves, J.; Clénet, Y.; Nicklas, H.; Pott, Jörg-Uwe; Ragazzoni, Roberto; Tolstoy, Eline; Agócs, Tibor; Anwand-Heerwart, H.; Barboza, Santiago; Baudoz, Pierre; Bender, Ralf; Bizenberger, Peter; Boccaletti, A.; Boland, W.; Bonifacio, P.; Briegel, Florian; Buey, Tristan; Chapron, F.; Cohen, Mathieu; Czoske, O.; Dreizler, S.; Falomo, R.; Feautrier, P.; Schreiber, N. Förster; Gendron, É.; Genzel, R.; Glück, Martin; Gratadour, Damien; Greimel, R.; Grupp, Frank; Hauser, M. G.; Haug, M.; Hennawi, Joseph F.; Hess, Hans-Joachim; Hörmann, Veronika; Hofferbert, R.; Hopp, U.; Hubert, Z.; Ives, Derek; Kausch, W.; Kerber, F.; Kravcar, H.; Kuijken, Konrad; Lang-Bardl, Florian; Leitzinger, M.; Leschinski, Kieran; Massari, D.; Mei, S.; Merlin, Francesca; Mohr, Lars; Monna, A.; Müller, Friedrich; Navarro, Ramón; Plattner, Markus; Przybilla, N.; Ramlau, Ronny; Ramsay, Suzanne; Ratzka, Thorsten; Rhode, P.; Richter, Josef; Rix, Hans─Walter; Rodeghiero, Gabriele; Rohloff, Ralf-Rainer; Rousset, G.; Ruddenklau, R.; Schaffenroth, V.; Schlichter, Jörg; Sevin, Arnaud; Stuik, Remko; Sturm, E.; Thomas, Jens; Tromp, Niels; Turatto, M.; Verdoes-Kleijn, Gijs; Vidal, Fabrice; Wagner, Roland; Wegner, Michael; Zeilinger, W. W.; Ziegler, B.; Zins, G.

doi:10.1117/12.2233047

Cited by 31 publications

(23 citation statements)

References 7 publications

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“…Moreover, I prove that SPADE can approach the optimal precision allowed by quantum mechanics in estimating the location and scale parameters of a subdiffraction object. Given the usefulness of moments in identifying the size and shape of an object [26], the proposed scheme, realizable with far-field linear optics and photon counting, should provide a major boost to incoherent imaging applications that are limited by diffraction and photon shot noise, including not only fluorescence microscopy [27][28][29][30] and space-based telescopes [31] but also modern ground-based telescopes [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Subdiffraction incoherent optical imaging via spatial-mode demultiplexing

Tsang¹

2017

New J. Phys.

130

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I propose a spatial-mode demultiplexing (SPADE) measurement scheme for the far-field imaging of spatially incoherent optical sources. For any object too small to be resolved by direct imaging under the diffraction limit, I show that SPADE can estimate its second or higher moments much more precisely than direct imaging can fundamentally do in the presence of photon shot noise. I also prove that SPADE can approach the optimal precision allowed by quantum mechanics in estimating the location and scale parameters of a subdiffraction object. Realizable with far-field linear optics and photon counting, SPADE is expected to find applications in both fluorescence microscopy and astronomy.

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Section: Introductionmentioning

confidence: 99%

Subdiffraction incoherent optical imaging via spatial-mode demultiplexing

Tsang¹

2017

New J. Phys.

130

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“…The MICADO optics are immersed in a cryogenic environment at about 40 K. As discussed in [1] the MICADO optical design is based on two TMAs mounted on fixed supports with no moving parts. Typical cryogenic integration tolerances for the TMAs are given by [9]:…”

Section: Micado Tolerances and Distortionmentioning

confidence: 99%

“…The primary goal and observing mode of MICADO is imaging, with a focus on differential astrometry with an accuracy of ~50 µas; the instrument provides also a spectroscopic mode with a resolution R~8000. The observing window of the instrument is 0.8-2.4 µm and when assisted by the Multi-conjugate Adaptive Optics RelaY (MAORY) it has a corrected FoV of 53" [1]. 50 µas differential astrometry is an ambitious goal and it requires careful estimations, control and calibration of all the systematics.…”

Section: Introductionmentioning

confidence: 99%

Towards an overall astrometric error budget with MICADO-MCAO

Rodeghiero

Pott

Massari

et al. 2017

Proceedings of the Adaptive Optics for Extremely Large Telescopes 5

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MICADO is the Multi-AO Imaging Camera for Deep Observations, and it will be one of the first light instruments of the Extremely Large Telescope (ELT). Doing high precision multi-object differential astrometry behind ELT is particularly effective given the increased flux and small diffraction limit. Thanks to its robust design with fixed mirrors and a cryogenic environment, MICADO aims to provide 50 µas absolute differential astrometry (measure star-to-star distances in absolute µas units) over a 53" FoV in the range 1.2-2.5 µm. Tackling high precision astrometry over large FoV requires Multi Conjugate Adaptive Optics (MCAO) and an accurate distortion calibration. The MICADO control scheme relies on the separate calibration of the ELT, MAORY and MICADO systematics and distortions, to ensure the best disentanglement and correction of all the contributions. From a system perspective, we are developing an astrometric error budget supported by optical simulations to assess the impact of the main astrometric errors induced by the telescope and its optical tolerances, the MCAO distortions and the opto-mechanical errors between internal optics of ELT, MAORY and MICADO. The development of an overall astrometric error budget will pave the road to an efficient calibration strategy complementing the design of the MICADO calibration unit. At the focus of this work are a number of opto-mechanical error terms which have particular relevance for MICADO astrometry applications, and interface to the MCAO design.

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“…The ELT is currently under construction with an estimated completion date around 2025. The other 2 first light instruments are MICADO [2], a near-infrared, 0.8-2.4 μm, imager and spectrograph, and HARMONI [3], an integral field spectrograph sensitive in the 0.47-2.45 μm regime. All 3 first ELT instruments come with adaptive optics tuned to the scientific requirements and goals of each instrument.…”

Section: Introductionmentioning

confidence: 99%

Single conjugate adaptive optics for the ELT instrument METIS

et al. 2018

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The European Extremely Large Telescope (ELT) is a 39 m large, ground-based optical and near-to mid-infrared telescope under construction in the Chilean Atacama desert. Operation is planned to start around the middle of the next decade. All first light instruments will come with wavefront sensing devices that allow control of the ELT's intrinsic M4 and M5 wavefront correction units, thus building an adaptive optics (AO) system. To take advantage of the ELT's optical performance, full diffraction-limited operation is required and only a high performance AO system can deliver this. Further technically challenging requirements for the AO come from the exoplanet research field, where the task to resolve the very small angular separations between host star and planet, has also to take into account the high-contrast ratio between the two objects. We present in detail the results of our simulations and their impact on high-contrast imaging in order to find the optimal wavefront sensing device for the METIS instrument. METIS is the mid-infrared imager and spectrograph for the ELT with specialised high-contrast, coronagraphic imaging capabilities, whose performance strongly depends on the AO residual wavefront errors. We examined the sky and target sample coverage of a generic wavefront sensor in two spectral regimes, visible and near-infrared, to pre-select the spectral range for the more detailed wavefront sensor type analysis. We find that the near-infrared regime is the most suitable for METIS. We then analysed the performance of Shack-Hartmann and pyramid wavefront sensors under realistic conditions at the ELT, did a balancing with our scientific requirements, and concluded that a pyramid wavefront sensor is the best choice for METIS. For this choice we additionally examined the impact of noncommon path aberrations, of vibrations, and the long-term stability of the SCAO system including high-contrast imaging performance.Keywords Single conjugate adaptive optics · SCAO · ELT · Pyramid wavefront sensor · Shack-Hartmann wavefront sensor · Fragmented pupil · Low wind effect · Non-common path aberrations · High-contrast imaging

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MICADO: first light imager for the E-ELT

Cited by 31 publications

References 7 publications

Subdiffraction incoherent optical imaging via spatial-mode demultiplexing

Subdiffraction incoherent optical imaging via spatial-mode demultiplexing

Towards an overall astrometric error budget with MICADO-MCAO

Single conjugate adaptive optics for the ELT instrument METIS

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