The Subaru Coronagraphic Extrem Ao: Near Diffraction Limit Visible Imageron A 8m Meter Telescope.

Details The Subaru Coronagraphic Extrem Ao: Near Diffraction Limit Visible Imageron A 8m Meter Telescope. The Subaru Coronagraphic Extrem Ao: Near Diffraction Limit Visible Imageron A 8m Meter Telescope.

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21941304g&link_type=abstract

American Astronomical Society, AAS Meeting #219, #413.04

Physics

Optics

Scientific paper

The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system is an instrument originally designed as a significant upgrade of the coronagraphic and AO correction capacity for the current infrared HiCIAO imager in order to greatly improve its image contrast in the very close (less than 0.5") neighborhood of stars. Next to its infrared coronagraphic path, a visible path has been implemented, composed of an high-order wavefront sensor and a dual wavelength visible science imager. The visible science imager relies on the capacity of two identical synchronized EMCCD cameras, offering photocounting ability. Benefiting from both adaptive optics correction and new data processing techniques, the visible imager is a powerful tool for high angular resolution imaging and opens numerous new science opportunities. We propose here a new image processing algorithm, based on the selection of the best signal for each spatial frequency. A factor 2 to 3 in Strehl ratio is obtained compared to the AO long exposure time depending on the image processing algorithm used and the seeing conditions. The system is able to deliver close to diffraction limited images at 650nm. Based on first on-sky results, we also demonstrate that this approach offers significantly better results than the classical lucky imaging approach while being simpler than other speckle interferometry techniques.

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