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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)


Seminars are also held at JAC, CFHT, and IfA.



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