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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, Masayuki Akiyama)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
January 25, Friday at 11:00 am
" Achromatic Interfero-Coronagraph with common-path: images from demonstrator and perspectives "
Alexander Tavrov (NAOJ)
A three-dimensional common-path interferometer is proposed,
which can achromatically null out an on-axis source while maintaining
the detectability of an off-axis source. A geometric phase in the
three-dimensional interferometer introduces an achromatic pi-phase shift
to the light from the on-axis source, such that destructive interference
nulls out the axial light at one of the ports of the interferometer.
Light from the off-axis source, which is exempt from destructive interference,
comes out from both ports with equal intensity. The common-path scheme
makes the system highly immune to environmental disturbances. In the
described experiment, a 10E-6 peak-to-peak nulling contrast was obtained
at 1-lambda/D distance. A proof for achromaticity and several perspectives
to enhance general AIC nulling performances will be discussed.
PDF file (143 kB)