Physics – Optics
Scientific paper
Aug 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1158..385h&link_type=abstract
EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, V
Physics
Optics
Ground-Based Ultraviolet, Optical And Infrared Telescopes, Charge-Coupled Devices, Image Detectors, And Ir Detector Arrays, Adaptive And Segmented Optics, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc.
Scientific paper
The curvature-wavefront-based adaptive optics (AO) system with a laser guide star is under commissioning at Subaru Telescope. The AO system has been in use since September 2008 using a natural guide star. The testing of laser projection on the sky resumed on February 13, 2009. We have obtained around 0.55 of Strehl ratio in the K band under seeing conditions of 0.4 arcsecond (at K band) using an 8th-magnitude single star. The Strehl ratio was about 0.2 in the K band using a faint guide star around 16th magnitude. Even though the seeing condition was 1 arcsecond, we obtained an almost diffraction-limited image. The total equivalent magnitude of the laser guide star was estimated at 10.7 magnitude. However, the full width half maximum is around 2 arcseconds under the seeing condition of 1 arcsecond in K-band.
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