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Proceedings Paper

'OHANA-Iki: a test-bed for the 'OHANA beam combiner and delay line at CFHT
Author(s): Marc Baril; Olivier Lai; George Zahariade; Flora Bouchacourt; Guy Perrin; Pierre Fedou; Julien Woillez
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Paper Abstract

The possibility of interferometrically coupling large telescopes using single-mode (SM) fibers is a very attractive one, especially at topographically complex and culturally sensitive astronomical observing sites such as the Mauna-Kea summit in Hawaii. The 'OHANA project (Optical Hawaiian Array for Nanoradian Astronomy) aims to link up seven of the large telescopes on Mauna-Kea. The concept of using SM fiber links for interferometry has been demonstrated using the two W. M. Keck telescopes. A beam-combiner and optical delay line has been installed at the Canada France Hawaii Telescope (CFHT) to link up Gemini North and CFHT. In order to test the CFHT beam-combiner without making use of CFHT and Gemini observing time, the idea of using two small, 20 cm aperture telescopes to inject starlight into the 'Ohana interferometer fibers was devised. This project, dubbed 'OHANA-Iki, is also exploring the concept of a "soft" optical interferometer, specifically one in which the telescopes are easily movable and would not require the heavy, fixed infrastructure found in conventional freespace interferometers such as the VLTI.

Paper Details

Date Published: 21 July 2010
PDF: 11 pages
Proc. SPIE 7734, Optical and Infrared Interferometry II, 77342C (21 July 2010); doi: 10.1117/12.856219
Show Author Affiliations
Marc Baril, Canada-France-Hawaii Telescope (United States)
Olivier Lai, Canada-France-Hawaii Telescope (United States)
George Zahariade, Canada-France-Hawaii Telescope (United States)
Flora Bouchacourt, Canada-France-Hawaii Telescope (United States)
Guy Perrin, LESIA, Observatoire de Paris à Meudon (France)
Pierre Fedou, LESIA, Observatoire de Paris à Meudon (France)
Julien Woillez, W. M. Keck Observatory (United States)

Published in SPIE Proceedings Vol. 7734:
Optical and Infrared Interferometry II
William C. Danchi; Françoise Delplancke; Jayadev K. Rajagopal, Editor(s)

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