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The Subaru Seminar is
usually held in Room 104 of the Hilo Base Facility, adjacent
to the main lobby. Everyone is welcome to attend. If you are
interested in giving a seminar, please contact Subaru seminar organizers
(Tomonori Usuda, Kumiko S. Usuda, Naoyuki Tamura)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
August 12th, Wednesday, at 10:00 am
" Pupil remapping high-dynamic range imager with single-mode fibers "
Takayuki Kotani
(ISAS/JAXA)
I will talk about the laboratory demonstration of a very high-dynamic
range, diffraction limited imaging instrument FIRST (Fibered Imager foR
Single Telescope). FIRST will allow us to achieve very high dynamic
range imaging very near the central object (a fraction of lambda/D) at
visible to near-infrared wavelengths, which makes this instrument very
complementary to adaptive-optics assisted coronagraph systems. The
fundamental idea is to apply techniques developed for long baseline
interferometry to the case of a single-aperture telescope. With FIRST, a
dynamic range is no longer limited by atmospheric turbulence which can
be totally filtered out and a raw dynamic range up to 10^6 will be
possible thanks to spatial filtering and pupil remapping with
single-mode fibers. We successfully demonstrated that the original image
can be reconstructed through a pupil remapping system in our laboratory.
A prototype system will be tested on a 1-meter telescope at the Paris
observatory in this Autumn, followed by a test on a 3-4 meter telescope.
Lastly, I will briefly present the present status of the OHANA
project, which aims at linking large telescopes on Maun Kea, including
Subaru, with single-mode fibers in order to realize a huge infrared
interferometer.