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Correction of differential chromatic dispersion in GRAVITY

MPS-Authors

Haubois,  Xavier
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lacour,  Sylvestre
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Perrin,  Guy S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dembet,  Roderick
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Le Bouquin,  Jean-Baptiste
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lapeyrère,  Vincent
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wolff,  Burkhard
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Eisenhauer,  Frank
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rousselet-Perraut,  Karine
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Straubmeier,  Christian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Amorim,  Antonio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Brandner,  Wolfgang
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018SPIE10701E..1PH
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Citation

Haubois, X., Lacour, S., Perrin, G. S., Dembet, R., Le Bouquin, J.-B., Lapeyrère, V., et al. (2018). Correction of differential chromatic dispersion in GRAVITY.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CD68-0
Abstract
The GRAVITY instrument installed at VLTI uses differential fibered delay lines to spatially filter the incoming wavefronts and accurately control the optical path difference between the Fringe Tracker (FT) and Scientific Detector (SC) parts of the instrument. On top of the differential dispersion occurring in the air, the chromatic dispersion introduced by these fibers impacts the real time performances of the fringe tracker by generating a second-order chromatic phase shift. Moreover, differential dispersion also affects GRAVITY dual-feed measurements that require a length adjustment of both FT and SC fibers. In this contribution, we show how chromatic dispersion can be corrected both in the fringe tracker real-time control as well as in the astrometric data reduction.