Adaptive Optics At The New Solar Telescope- Present, Future And Beyond -

Details Adaptive Optics At The New Solar Telescope- Present, Future And Beyond - Adaptive Optics At The New Solar Telescope- Present, Future And Beyond -

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0104k&link_type=abstract

American Astronomical Society, SPD meeting #42, #1.04; Bulletin of the American Astronomical Society, Vol. 43, 2011

Physics

Optics

Scientific paper

The New Solar Telescope (NST) on Big Bear Lake, California, has a 1.6m off-axis primary mirror and is equipped with a 76 element adaptive-optics system. Diffraction limited resolution is attained in the visible after speckle reconstruction. Without speckle reconstruction, and under good atmospheric conditions, the resolution approaches the diffraction limit in the infrared. However, with a single deformable mirror, the atmospheric turbulence is corrected only inside the isoplanatic patch, typically 10" in diameter.
Sunspots and active regions extend over roughly1'-2'. To attain the diffraction-limit over such field sizes, multi-conjugate adaptive optics (MCAO) applies a wavefront correction that varies inside the field. At the NST we will use three deformable mirrors to correct for the atmospheric turbulence inside a field of 90". This will be done in two stages: in summer 2011, a 308 element ground-conjugated adaptive-optics system should yield diffraction limited resolution in the visible, over the isoplanatic patch.
In spring 2012 the addition of two deformable mirrors with 308 and 76 effective actuators should allow us to approach the diffraction limit in the visible, and inside a 90" field of view. The optimum conjugation heights of the two mirrors will be assessed after an atmospheric monitoring campaign.
The adaptive-optics development at NST will prepare the way for the 4m off-axis ATST telescope, which is to see first light in 2016.

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