1. The MICADO first light imager for ELT: cold optics instrument
- Author
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R. Davis, N. Ageorges, V. Garrel, Christopher Mandla, Hans Gemperlein, Eckhard Sturm, Sebastian Rabien, Veronika Hörmann, L. Barl, D. Kampf, Norbert Geis, Michael Hartl, R. Rüddenklau, J. Ziegleder, M. Manhart, and Josef Schubert
- Subjects
Physics ,Spectrometer ,business.industry ,Optical instrument ,First light ,01 natural sciences ,law.invention ,010309 optics ,Optics ,Cardinal point ,Laser guide star ,law ,0103 physical sciences ,Extremely Large Telescope ,business ,Adaptive optics ,010303 astronomy & astrophysics ,Coronagraph - Abstract
MICADO, the Multi-AO-Imaging-Camera and Spectrometer for Deep Observations, is one of the first light instruments for the future 40 m class Extremely Large Telescope (ELT). MICADO utilizes the advanced laser guide star multiconjugate adaptive optics system MCAO developed by the MAORY consortium and the jointly developed singleconjugate adaptive optics system (SCAO). We present an overview on the conceptual design of the MICADO Cold Optical Instrument (COI) which comprises the infrared focal plane imager with its 3 x 3 4k2 HgCdTe detector array and a compact cross-dispersing slit spectrometer operating in the spectral range of 0.8 to 2.4 μm. High contrast imaging is enabled via a classical configuration of coronagraph and Lyot stops. The paper summarizes the MICADO COI interchangeable optics, its cryogenic implementation together with the modular opto-mechanical configuration of the cryo-mechanisms and the cryo-vacuum cooling system, which consists of a continuous LN2 flow cryostat.
- Published
- 2018
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