Outdoor fibre link between two telescopes and the lab of the CHARA array at 810 nm. Demonstration of the optical path servo control - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Experimental Astronomy Année : 2024

Outdoor fibre link between two telescopes and the lab of the CHARA array at 810 nm. Demonstration of the optical path servo control

Résumé

In the framework of the ALOHA (Astronomical Light Optical Hybrid Analysis) project, dedicated to high resolution imaging in the L-band using optical fibre and nonlinear optics, we have implemented a servo controlled hectometric outdoor fibre link between two telescopes and the recombination beam facility of the CHARA telescope array. A two-stage servo system using optical fibre modulator, fibre delay line, and a metrology laser at 1064 nm allows to stabilise the optical path difference within 3 nm RMS over a 3000 s record. Using an internal source at 810 nm, the signal-to-noise ratio of the fringe modulation peak is enhanced by a factor better than two when the servo control is switched on. This study can be also considered as a seminal work towards very long base fibre linked telescope arrays and allows to scale the perturbative environment of an outdoor fibre link.

Dates et versions

hal-04507266 , version 1 (16-03-2024)

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Magri Julie, Grossard Ludovic, Reynaud François, Fabert Marc, Delage Laurent, et al.. Outdoor fibre link between two telescopes and the lab of the CHARA array at 810 nm. Demonstration of the optical path servo control. Experimental Astronomy, 2024, 57 (2), pp.13. ⟨10.1007/s10686-024-09935-x⟩. ⟨hal-04507266⟩
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