Multichannel spectral mode of the ALOHA up-conversion interferometer

Lucien Lehmann (1) , Pascaline Darré (1, 2) , Hervé Boulogne (1) , Laurent Delage (1) , Ludovic Grossard (1) , François Reynaud (1)

1 XLIM-PHOT - Photonique Fibre et Sources Cohérentes
2 ESO - European Southern Observatory

In this paper, we propose a multichannel spectral configuration of the Astronomical Light Optical Hybrid Analysis (ALOHA) instrument dedicated to high resolution imaging. A frequency conversion process is implemented in each arm of an interferometer to transfer the astronomical light to a shorter wavelength domain. Exploiting the spectral selectivity of this non-linear optical process, we propose to use a set of independent pump lasers in order to simultaneously study multiple spectral channels. This principle is experimentally demonstrated with a dual-channel configuration as a proof-of-principle.

Mots clés: Instrumentation: high angular resolution; techniques: interferometric

Domaines: Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]; Optique / photonique

Lucien Lehmann, Pascaline Darré, Hervé Boulogne, Laurent Delage, Ludovic Grossard, et al.. Multichannel spectral mode of the ALOHA up-conversion interferometer. Monthly Notices of the Royal Astronomical Society, 2018, 477 (1), pp.190-194. ⟨10.1093/mnras/sty648⟩. ⟨hal-02093501⟩