EAGLE: an MOAO fed multi-IFU working in the NIR on the E-ELT

Cuby, Jean-Gabriel; Morris, S. L.; Parr-Burman, P.; Lehnert, M. D.; Evans, C. J.; Fusco, Thierry; Jagourel, Pascal; Mignant, D. Le; Myers, R; Rousset, G.; Schnetler, Hermine; Amans, Jean-Philippe; Assémat, F.; Beard, Stephen; Cohen, Mathieu; Dipper, N. A.; Ferrari, Marc; Gendron, É.; Gimenez, Jean-Luc; Hastings, Peter; Hubert, Z.; Hugot, Emmanuel; Laporte, Philippe; Leroux, Brice; Madec, F.; McGregor, Helen; Morris, Tim; Neichel, Benoît; Puech, M.; Robert, Clélia; Rolt, Stephen; Swinbank, A. M.; Talbot, Gordon; Taylor, W. D.; Vidal, F.; Vivès, S.; Vola, Pascal; Wells, Martyn

doi:10.1117/12.829213

Cited by 5 publications

(2 citation statements)

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“…Of course, it is not a perfect scale model, as we cannot scale the atmospheric profile. However, it will be a very valuable proof-ofconcept for MOAO in the configuration envisaged by the EAGLE concept [19]. It will also provide experience of realtime control techniques and calibration in a realistic environment, significantly de-risking the EAGLE project.…”

Section: William Herschel Telescope Test-bedmentioning

confidence: 99%

The OPTICON technology roadmap for optical and infrared astronomy

2010

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The Key Technology Network (KTN) within the OPTICON programme has been developing a roadmap for the technology needed to meet the challenges of optical and infrared astronomy over the next few years, with particular emphasis on the requirements of Extremely Large Telescopes. The process and methodology so far will be described, along with the most recent roadmap.The roadmap shows the expected progression of ground-based astronomy facilities and the technological developments which will be required to realise these new facilities. The roadmap highlights the key stages in the development of these technologies.In some areas, such as conventional optics, gradual developments in areas such as light-weighting of optics will slowly be adopted into future instruments. In other areas, such as large area IR detectors, more rapid progress can be expected as new processing techniques allow larger and faster arrays. Finally, other areas such as integrated photonics have the potential to revolutionise astronomical instrumentation.Future plans are outlined, in particular our intention to look at longer term development and disruptive technologies.

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Section: William Herschel Telescope Test-bedmentioning

confidence: 99%

The OPTICON technology roadmap for optical and infrared astronomy

2010

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“…Advances in high-contrast imaging techniques and increased telescope sizes require DMs mirrors with thousands of actuators [1]- [3]. In response to these needs, Iris AO has been developing a nearly 500-actuator DM and is conducting pathfinding research into 3000-actuator class DMs.…”

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confidence: 99%

Preliminary results of large-actuator-count MEMS DM development

Helmbrecht

Rhodes

et al. 2010

SPIE Proceedings

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Compensating for atmospheric turbulence in meter-class telescopes and for free-space communications can require deformable mirrors (DM) with hundreds of actuators. Advances in high-contrast imaging techniques and increased telescope sizes require DMs mirrors with thousands of actuators [1]- [3]. In response to these needs, Iris AO has been developing a nearly 500-actuator DM and is conducting pathfinding research into 3000-actuator class DMs. This paper begins with an overview of the segmented DM design and describes improvements made to the DM over the prior year in the areas of speed, high-quality dielectric coatings, and snap-in prevention structures. The paper then describes the next-generation PTT489 DM design and fabrication process. Failure modes encountered during fabrication are presented as well as test methods to detect the failure modes. Preliminary yield data are presented for the fabrication process as well. The paper concludes with a view to the future showing pathfinding research into 3000-actuator DMs. PTT SEGMENTED DM DESIGN OVERVIEWThe Iris AO piston/tip/tilt (PTT) segmented deformable mirror (DM) is based on the PTT segment schematic diagram shown in Figure 1a. Many of these three degree of freedom segments are tiled in a hexagonally close-packed pattern to form larger arrays. A photograph of a packaged PTT111-5 DM (111-actuators, 37 PTT segments, 5 µm stroke) is shown in Figure 1b. All of the DMs manufactured by Iris AO use the same basic segment design. Therefore, all of the knowledge gained from developing the PTT111 DM design transfers to larger mirrors described herein.The MEMS DM is a hybrid of surface micromachining and bulk micromachining technologies [4] [5]. Conventional polysilicon surface micromachining technology, in this case the SUMMiT IV process, creates the actuator platform, electrodes, and underlying electrical interconnect (not shown in the schematic) shown in Figure 1a. The top layer of the bimorph flexure is added by Iris AO in order to lift the structure 20-40 µm above the substrate after release. The bimorph layer was chosen such that the coefficient of thermal expansion (CTE) is matched as close to the polysilicon as possible. * michael.helmbrecht@irisao.com, phone (510) 849-2375, www.irisao.com Electrodes Tempera ture Insensitive Bimorph Flexure Bondsites Rigid High-Qua lity Mirror Segment Actua tor Pla tform Figure 1: a) Schematic diagram of a 700 µm diameter (vertex-to-vertex) mirror segment. Scaling is highly exaggerated in the vertical direction. b) Die photograph of a 111-actuator 37-piston/tip/tilt-segment DM with 3.5 mm inscribed aperture (Product name: PTT111-5).

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