EADS Astrium Nulling Interferometer Breadboard for DARWIN and GENIE

Astronomy and Astrophysics – Astronomy

Scientific paper

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Optical Instruments, Space Science, Astronomy, Darwin

Scientific paper

Within the context of the ESA TRP programme for DARWIN, a Nulling Interferometer Breadboard for the Near-Infrared was developed and tested. Its basic principle is recombining two light beams relying on a highly symmetric optical design (autobalanced Sagnac Core). Two different star simulators have been implemented, based on a) amplitude division and b) on wavefront division. The required achromatic Pi phase shift was implemented using a) dispersive phase shifter, and b) periscopes (geometrical pupil and field rotation). Due to the extremely symmetric optical design, very good star suppression up to 400000 has been achieved. OPD control better than 1 nm RMS has been demonstrated over hours.

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