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The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is amultipurpose high-contrast imaging platform designed for the discovery anddetailed characterization of exoplanetary systems and serves as a testbed forhigh-contrast imaging technologies for ELTs. It is a multi-band instrumentwhich makes use of light from 600 to 2500nm allowing for coronagraphic directexoplanet imaging of the inner 3 lambda/D from the stellar host. Wavefrontsensing and control are key to the operation of SCExAO. A partial correction oflow-order modes is provided by Subaru's facility adaptive optics system withthe final correction, including high-order modes, implemented downstream by acombination of a visible pyramid wavefront sensor and a 2000-element deformablemirror. The well corrected NIR (y-K bands) wavefronts can then be injected intoany of the available coronagraphs, including but not limited to the phaseinduced amplitude apodization and the vector vortex coronagraphs, both of whichoffer an inner working angle as low as 1 lambda/D. Non-common path, low-orderaberrations are sensed with a coronagraphic low-order wavefront sensor in theinfrared (IR). Low noise, high frame rate, NIR detectors allow for activespeckle nulling and coherent differential imaging, while the HAWAII 2RGdetector in the HiCIAO imager and/or the CHARIS integral field spectrograph(from mid 2016) can take deeper exposures and/or perform angular, spectral andpolarimetric differential imaging. Science in the visible is provided by twointerferometric modules: VAMPIRES and FIRST, which enable sub-diffractionlimited imaging in the visible region with polarimetric and spectroscopiccapabilities respectively. We describe the instrument in detail and presentpreliminary results both on-sky and in the laboratory.

The Subaru Coronagraphic Extreme Adaptive Optics system: enabling high-contrast imaging on solar-system scales