A step towards very high angular resolution in the near infrared : the 'OHANA project

Details A step towards very high angular resolution in the near infrared : the 'OHANA project A step towards very high angular resolution in the near infrared : the 'OHANA project

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...204.0816p&link_type=abstract

American Astronomical Society Meeting 204, #08.16; Bulletin of the American Astronomical Society, Vol. 36, p.982

Physics

Optics

1

Scientific paper

Current large-telescope interferometers have baselines limited to a few hundred meters giving access to resolutions in the 1-2.4 micron range larger than 1 mas. Breaking this limit is necessary to some astrophysical programs such as studying the central astronomical units of young stellar objects where planets form or getting a closer look to the inner environment of active galactic nuclei. Current interferometric technologies make use of classical optics to guide the beams from the telescope focus to the combining focus. Although very successful this technique suffers from a drawback that may limit its potential. A large number of mirrors are necessary thus causing flux losses due to optical imperfections. Diffraction is also a major issue as the size of mirrors needs to be kept reasonable. In practice, the transmission of interferometers is of a few percents. In order to reach better resolutions, kilometric baselines become necessary. The 'OHANA project (the Optical Hawaiian Array for Nanoradian Astronomy) aims at demonstrating the possibility to realize such an instrument by coupling the Mauna Kea large apertures using single-mode fibers in the J, H and K bands. Single-mode fibers allow to propagate beams on kilometric distances. We present the current status of the project and the results of the critical tests already performed prior to first combination in 2004.

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