Current status of he laser guide star adaptive optic system for Subaru Telescope

摘要

The current status and recent results, since last SPIE conference at Orlando in 2006, for the laser guide staradaptive optics system for Subaru Telescope is presented. We had a first light using natural guide star andsucceed to launch the sodium laser beam in October 2006. The achieved Strehl ratio on the 10th magnitude starwas around 0.5 at K band. We confirmed that the full-width-half-maximum of the stellar point spread functionis smaller than 0.1 arcsec even at the 0.9 micrometer wavelehgth. The size of the artificial guide star by thelaser beam tuned at the wavelength of 589 nm was estimated to be 10 arcsec. The obtained blurred artificialguide star is caused by the wavefront error on the laser launching telescope. After the first light and first launch,we found that we need to modify and to fix the components, which are temporarily finished. Also components,which were postponed to fabricate after the first light, are required to build newly. All components used bythe natural guide star adaptive optics system are finalized recently and we are ready to go on the sky. Nextengineering observation is scheduled in August, 2008.