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Proceedings Paper

Intensity interferometry revival on the Côte d’Azur
Author(s): Olivier Lai; William Guerin; Farrokh Vakili; Robin Kaiser; Jean Pierre Rivet; Mathilde Fouché; Guillaume Labeyrie; Julien Chabé; Clément Courde; Etienne Samain; David Vernet
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Paper Abstract

Recent advances in photonics have revived the interest in intensity interferometry for astronomical applications. The success of amplitude interferometry in the early 1970s, which is now mature and producing spectacular astrophysical results (e.g. GRAVITY, MATISSE, CHARA, etc.), coupled with the limited sensitivity of intensity interferometry stalled any progress on this technique for the past 50 years. However, the precise control of the optical path difference in amplitude interferometry is constraining for very long baselines and at shorter wavelengths. Polarization measurements are also challenging in amplitude interferometry due to instrumental effects. The fortuitous presence of strong groups in astronomical interferometry and quantum optics at Université Côte d’Azur led to the development of a prototype experiment at Calern Observatory, allowing the measure of the temporal correlation g(2)(τ, r=0) in 2016 and of the spatial correlation g(2)(r) in 2017 with a gain in sensitivity (normalized in observing time and collecting area) of a factor ~100 compared to Hanbury Brown and Twiss’s original Narrabri Interferometer. We present possible ways to further develop this technique and point to. possible implementations on existing facilities, such as CTA, the VLTI ATs or the summit of Maunakea, which offer a unique scientific niche.

Paper Details

Date Published: 9 July 2018
PDF: 12 pages
Proc. SPIE 10701, Optical and Infrared Interferometry and Imaging VI, 1070121 (9 July 2018); doi: 10.1117/12.2309491
Show Author Affiliations
Olivier Lai, Univ. Côte d'Azur, Observatoire de la Côte d'Azur, CNRS, Lab. Lagrange (France)
William Guerin, Univ. Côte d'Azur, CNRS, Institut de Physique de Nice (France)
Farrokh Vakili, Univ. Côte d’Azur, Obserbatoire de la Cote d'Azur, CNRS, Lab. Lagrange (France)
Robin Kaiser, Univ. Côte d'Azur, CNRS, Institut de Physique de Nice (France)
Jean Pierre Rivet, Univ. Côte d’Azur, Obserbatoire de la Cote d'Azur, CNRS, Lab. Lagrange (France)
Mathilde Fouché, Univ. Côte d'Azur, CNRS, Institut de Physique de Nice (France)
Guillaume Labeyrie, Univ. Côte d'Azur, CNRS, Institut de Physique de Nice (France)
Julien Chabé, Observatoire de la Côte d'Azur, CNRS (France)
Clément Courde, Observatoire de la Côte d'Azur, CNRS (France)
Etienne Samain, Observatoire de la Côte d'Azur, CNRS (France)
David Vernet, Observatoire de la Côte d'Azur, CNRS (France)


Published in SPIE Proceedings Vol. 10701:
Optical and Infrared Interferometry and Imaging VI
Michelle J. Creech-Eakman; Peter G. Tuthill; Antoine Mérand, Editor(s)

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