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

Julian C. Christou; Donald T. Gavel; Jennifer Patience; Elinor L. Gates

doi:10.1117/12.454805

4 February 2002 Preliminary measurements of residual tip-tilt motion and Strehl ratios for laser guide star compensation at Lick Observatory

Julian C. Christou, Donald T. Gavel, Jennifer Patience, Elinor L. Gates

Author Affiliations +

Proceedings Volume 4494, Adaptive Optics Systems and Technology II; (2002) https://doi.org/10.1117/12.454805
Event: International Symposium on Optical Science and Technology, 2001, San Diego, CA, United States

Abstract

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 (t_exp = 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%.

Citation Download Citation

Julian C. Christou, Donald T. Gavel, Jennifer Patience, and Elinor L. Gates "Preliminary measurements of residual tip-tilt motion and Strehl ratios for laser guide star compensation at Lick Observatory", Proc. SPIE 4494, Adaptive Optics Systems and Technology II, (4 February 2002); https://doi.org/10.1117/12.454805

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