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Increasing the imaging capabilities of the VLTI using integrated optics

Kern, Pierre and Malbet, Fabien and Berger, Jean-Philippe and Haguenauer, Pierre and Schanen, Isabelle and Labeye, Pierre and Perraut-Rousselet, Karine and Arezki, Brahim and Delboulbe, Alain and Jocou, Laurent and Perrier, Christian and Traub, W. and Millan-Gabet, R. and Monnier, J. and Pedretti, E. and Glindemann, A. and Kervella, P. and Di Folco, E. and Gitton, P. (2003) Increasing the imaging capabilities of the VLTI using integrated optics. In: Interferometry for Optical Astronomy II. Proceedings of SPIE. No.4838. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 312-320. ISBN 9780819446176.

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Several scientific topics linked to the observation of extended structures around astrophysical sources (dust torus around AGN, disks around young stars, envelopes around AGBs) require imaging capability with milli-arcsecond spatial resolution. The current VLTI instruments, AMBER and MIDI, will provide in the coming months the required high angular resolution, yet without actual imaging. As a rule of thumb, the image quality accessible with an optical interferometer is directly related to the number of telescopes used simultaneously: the more the apertures, the better and the faster the reconstruction of the image. We propose an instrument concept to achieve interferometric combination of N telescopes (4 ≤ N ≤ 8) thanks to planar optics technology: 4 x 8-m telescopes in the short term and/or 8 x 1.8-m telescopes in the long term. The foreseen image reconstruction quality in the visible and/or in the near infrared will be equivalent to the one achieved with millimeter radio interferometers. Achievable spatial resolution will be better than the one foreseen with ALMA. This instrument would be able to acquire routinely 1 mas resolution images. A 13 to 20 magnitude sensitivity in spectral ranges from 0.6 to 2.5 μm is expected depending on the choice of the phase referencing guide source. High dynamic range, even on faint objects, is achievable thanks to the high accuracy provided by integrated optics for visibility amplitude and phase measurements. Based on recent validations of integrated optics presented here an imaging instrument concept can be proposed. The results obtained using the VLTI facilities give a demonstration of the potential of the proposed technique.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Berger, Jean-Philippe0000-0001-5025-0428
Millan-Gabet, R.0000-0003-0447-5866
Monnier, J.0000-0002-3380-3307
Kervella, P.0000-0003-0626-1749
Additional Information:© 2003 Society of Photo-optical Instrumentation Engineers (SPIE). Authors wish to thanks all members of the IONIC team at LETI, IMEP and LAOG, and GeeO. All results presented here where obtained with components manufactured with IMEP, LETI and GeeO facilities. Part of this work has been funded by CNES and CNRS / INSU. Development related to nulling breadboard is funded by ESA in the framework of the DARWIN mission.
Funding AgencyGrant Number
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut National des Sciences de l'Univers (INSU)UNSPECIFIED
European Space Agency (ESA)UNSPECIFIED
Subject Keywords:Interferometry, integrated optics, guided optics, closure phase
Series Name:Proceedings of SPIE
Issue or Number:4838
Record Number:CaltechAUTHORS:20190116-081409288
Persistent URL:
Official Citation:Pierre Y. Kern, Fabien Malbet, Jean-Philippe Berger, Pierre Haguenauer, Isabelle Schanen-Duport, Pierre Labeye, Karine Perraut-Rousselet, Brahim Arezki, Alain Delboulbe, Laurent Jocou, Christian Perrier-Bellet, Wesley A. Traub, Rafael Millan-Gabet, John D. Monnier, Ettore Pedretti, Andreas Glindemann, Pierre Kervella, Emmanuel di Folco, Philippe B. Gitton, "Increasing the imaging capabilities of the VLTI using integrated optics," Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.459074
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92308
Deposited By: Tony Diaz
Deposited On:16 Jan 2019 22:08
Last Modified:16 Nov 2021 03:49

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