Status of the MMT Observatory multiple laser beacon projector

Details Status of the MMT Observatory multiple laser beacon projector Status of the MMT Observatory multiple laser beacon projector

Sep 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6691e..16s&link_type=abstract

Astronomical Adaptive Optics Systems and Applications III. Edited by Tyson, Robert K.; Lloyd-Hart, Michael. Proceedings of the

Physics

Optics

Scientific paper

The laser guidestar system at the MMT Observatory has produced its first closed loop results and should be producing ground-layer corrected closed loop images within a few months. The LGS system at the MMT is one of few in the world that uses atmospheric Rayleigh scattering from reliable, low-cost lasers, and is unique in its use of a dynamic refocus technique to increase the telescope depth of field for increased return flux. The resulting 10 km depth of field introduces additional constraints on the minimum spot size for the beam projector design. The short exposure spot size as measured at the telescope cassegrain focus is 0.65 arcseconds in 0.59 arcsecond seeing in the visible. Additionally, a method to correct for image motion due to telescope vibrations using accelerometer data has been successfully implemented.

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