Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-03
Exper.Astron. 10 (2000) 89-101
Astronomy and Astrophysics
Astrophysics
Experimental Astronomy (special issue about ALFA), accepted
Scientific paper
The ALFA laser subsystem uses a 4 watt continuous wave laser beam to produce an artificial guide star in the mesospheric sodium layer as a reference for wavefront sensing. In this article we describe the system design, focusing on the layout of the beam relay system. It consists of seven mirrors, four of which are motor-controlled in closed loop operation accounting for turbulences inside the dome and flexure of the main telescope. The control system features several computers which are located close to analysis and control units. The distribution of the tasks and their interaction is presented, as well as the graphical user interface used to operate the complete system. This is followed by a discussion of the aircraft detection system ALIENS. This system shuts off the laser beam when an object passes close to the outgoing laser.
Eckart Andreas
Hackenberg Wolfgang
Hippler Stefan
Ott Th.
Rabien Sebastian
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