Preliminary measurements of residual tip-tilt motion and Strehl ratios for laser guide star compensation at Lick Observatory

Details Preliminary measurements of residual tip-tilt motion and Strehl ratios for laser guide star compensation at Lick Observatory Preliminary measurements of residual tip-tilt motion and Strehl ratios for laser guide star compensation at Lick Observatory

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4494..317c&link_type=abstract

Proc. SPIE Vol. 4494, p. 317-324, Adaptive Optics Systems and Technology II, Robert K. Tyson; Domenico Bonaccini; Michael C. Rog

Physics

Optics

Scientific paper

Adaptive optics performance using a sodium laser guide star at the Lick Observatory 3.0 m telescope is presented. In order to accomplish this the residual effects of natural guide star tip-tilt motion is removed. This is measured from 500 short exposure images (texp = 57ms). The data show instantaneous Strehl ratios ranging from ~ 0.10 to ~ 0.45 with a mean value of ~ 0.26. Centroid tracking of these data yield residual tip-tilt errors of ~ 21 mas, within specifications for the system. This resdual tip-tilt motion reduces the Strehl ratio of long exposure imaging by only ~ 7%.

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