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Environmental characterisation and stabilisation of a 2×200-meter outdoor fibre interferometer at the CHARA Array

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Abstract

In the framework of the ALOHA project (Astronomical Light Optical Hybrid Analysis), devoted to high resolution imaging in the L band, we investigate in this paper the possibility to deploy fibre links between the telescopes of the CHARA Array. As a first step, we set up an outdoor hectometric fibre interferometer to measure the vibration environment at the Mount Wilson Observatory. The optical path difference of this interferometer has been actively stabilised within an accuracy better than 4 nmrms, a stability largely sufficient for any interferometric application.

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Acknowledgments

This work has been financially supported by the Institut National des Sciences de l’Univers (INSU), the Centre National d’Études Spatiales (CNES) and Thales Alenia Space. We also thank all the OHANA team for lending the optical fibre. The CHARA Array of Georgia State University is supported by the National Science Foundation.

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Authors and Affiliations

  1. XLIM, 123 rue A. Thomas, 87060, Limoges, France

    Lucien Lehmann, Laurent Delage, Ludovic Grossard & Francois Reynaud

  2. The CHARA Array, Mt. Wilson Observatory, Mt. Wilson, CA, 91023, USA

    Steve Golden, Craig Woods, Larry Webster, Judit Sturmann & Theo ten Brummelaar

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  1. Lucien Lehmann
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  2. Laurent Delage
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  3. Ludovic Grossard
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  4. Francois Reynaud
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  5. Steve Golden
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  7. Larry Webster
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  8. Judit Sturmann
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  9. Theo ten Brummelaar
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Correspondence to Lucien Lehmann.

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Lehmann, L., Delage, L., Grossard, L. et al. Environmental characterisation and stabilisation of a 2×200-meter outdoor fibre interferometer at the CHARA Array. Exp Astron 47, 303–312 (2019). https://doi.org/10.1007/s10686-019-09627-x

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