SOAR Adaptive Module (SAM): seeing improvement with a UV laser
  The adaptive module of the 4.1-m SOAR telescope, SAM, corrects ground-layer turbulence using a UV laser guide star. It has been commissioned in 2013 and it is in regular science operation since 2014. SAM works with the CCD imager covering a 3' field or with the speckle camera. It operates routinely and stably, delivering resolution in the I band equal to the free-atmosphere seeing. This paper describes the SAM system as a whole, providing essential reference for its users and technical information of interest to instrumentalists. Operation of the instrument, its performance, and science projects done with SAM so far are reviewed. 
Andrei Tokovinin, Rolando Cantarutti, Roberto Tighe, Patricio   Schurter, Manuel Martinez, Sandrine Thomas, Nicole van der Bliek
astro-ph.IM