High Contrast Imaging with Focal Plane Wavefront Sensing and PIAA for Subaru Telescopes Olivier Guyon ([email protected]) Basile Gallet ([email protected]) Eugene Pluzhnik ([email protected]) Hideki Takami ([email protected]) Shinichiro Takana Subaru Telescope / National Astronomical Observatory of Japan Motohide Tamura Lyu Abe National Astronomical Observatory of Japan Subaru AO team & HiCIAO team
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High Contrast Imaging with Focal Plane Wavefront Sensing and PIAA for Subaru Telescopes Olivier Guyon ([email protected]) Basile Gallet ([email protected])
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High Contrast Imaging with FocalPlane Wavefront Sensing and PIAA for Subaru Telescopes
Fast(er) algorithm using linear approximations – few mson single CPU, code not optimized for speed
PIAA coronagraph development at Subaruco-funded by JPL and Subaru/NAOJ
Utilizes lossless beam apodization with aspheric optics(mirrors or lenses) to concentrate starlight is single diffractionpeak (no Airy rings).
- high contrast- Nearly 100% throughput- IWA < 2 l/d- 100% search area- no loss in angular resol.- can remove central obsc.and spiders- achromatic (with mirrors)
For Subaru, Lyot Coronagraph with PIAA- apodized inputpupil. IWA ~ 1 lambda/d
Early demonstration in lab
(Galicher et al. 2005)
Lenses made byMasashi Otsubo (ATC, NAOJ)
PIAA mirror units (Axsys)JPL-funded TPF-C technology development
32x32 MEMs DM is used for FPAO test in lab with PIAA coronagraph
One of 14 boardsto drive the MEMsDM.80 channels/board
16 bit resolutionslow & fast interface(> kHz update)
S. ColleyAO electronic eng.Subaru Telescope
Closed loop WFC
Without prior knowledge,3 frames sufficient forWF measurement
Low Order Wavefront Sensor (LOWFS)
LOWFS performance
Small (<<lambda) wavefront error produces large flux changesin the LOWFS images