FFREE: a Fresnel-FRee Experiment for EPICS, the EELT planets imager

Details FFREE: a Fresnel-FRee Experiment for EPICS, the EELT planets imager FFREE: a Fresnel-FRee Experiment for EPICS, the EELT planets imager

2010-09-17

arxiv.org/abs/1009.3474v1

Physics

Optics

12 pages, 15 figures, Proceeding 7736120 of the SPIE Conference "Adaptive Optics Systems II", monday 28 June 2010, San Diego,

Scientific paper

The purpose of FFREE - the new optical bench devoted to experiments on high-contrast imaging at LAOG - consists in the validation of algorithms based on off-line calibration techniques and adaptive optics (AO) respectively for the wavefront measurement and its compensation. The aim is the rejection of the static speckles pattern arising in a focal plane after a diffraction suppression system (based on apodization or coronagraphy) by wavefront pre-compensation. To this aim, FFREE has been optimized to minimize Fresnel propagation over a large near infrared (NIR) bandwidth in a way allowing efficient rejection up to the AO control radius, it stands then as a demonstrator for the future implementation of the optics that will be common to the scientific instrumentation installed on EPICS.

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