Gemini North - LGS Structure

This image shows the Gemini North Telescope on the evening of April 19th, 2005 during evening twilight. Featured on the foreground of the telescope is the laser guide star (LGS) clean-room (blue box with white door). The Gemini solid-state sodium laser is located in this box and shines up through a network of tubes and relay optics (also visible) where the beam is "launched" by optics located behind the secondary mirror.