Share Email Print
cover

Proceedings Paper

Interferometric direct imaging properties of a BIGRE-DAM device in laboratory
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

DAM (Discretized Aperture Mapping) is an original optical concept able to improve the performance in high angular resolution and high contrast imaging by the present class of large telescopes equipped with adaptive optics. By discretizing the entrance pupil of a large telescope into an array of many coherent sub-apertures, DAM provides unique imaging and filtering properties by means of spatial filtering and interferometric techniques. DAM can be achieved by means of single-mode fibers, integrated optic waveguides, pinholes, or simply with an innovative BIGRE optical device. BIGRE is formed of an afocal double micro-lenses array. In addition to the pupil discretization process by spatial filtering, BIGRE can also provide two other optical processes: the pupil densification or the pupil dilution. DAD (Discretized Aperture Densification) increase the sub-aperture sizes and is suitable to a hypertelescope, whereas DADI (Discretized Aperture Dilution Interferometry) reduces the sub-aperture sizes and turns a large telescope into a Fizeau interferometer. This paper deals with the first in-lab experiment at visible wavelength of BIGRE devices for the three configurations above. We study the point spread function (PSF) when observing a point-like object located either on-axis or at various off-axis positions across the field of view. Both interferometric and diffractive effects are described. The experimental measurements are in good agreement with the BIGRE theory. It results that BIGRE fulfils the requirements to carry out spatially filtered pupil discretization (DAM), with possible densification (DAD) or dilution (DADI).

Paper Details

Date Published: 16 August 2016
PDF: 14 pages
Proc. SPIE 9907, Optical and Infrared Interferometry and Imaging V, 99072U (16 August 2016); doi: 10.1117/12.2233108
Show Author Affiliations
Fabien Patru, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Jacopo Antichi, INAF - Osservatorio Astrofisico di Arcetri (Italy)
Patrick Rabou, Institut de Planétologie et d'Astrophysique de Grenoble (France)
Enrico Giro, INAF - Osservatorio Astronomico di Padova (Italy)
Jacopo Farinato, INAF - Osservatorio Astronomico di Padova (Italy)
Raffaele Gratton, INAF - Osservatorio Astronomico di Padova (Italy)
Daniele Vassallo, INAF - Osservatorio Astronomico di Padova (Italy)
Christophe Verinaud, Institut de Planétologie et d'Astrophysique de Grenoble (France)
Denis Mourard, Observatoire de la Côte d'Azur (France)
Julien Girard, European Southern Observatory (Chile)


Published in SPIE Proceedings Vol. 9907:
Optical and Infrared Interferometry and Imaging V
Fabien Malbet; Michelle J. Creech-Eakman; Peter G. Tuthill, Editor(s)

© SPIE. Terms of Use
Back to Top