Fig. 3.

Overview of the ARGOS components as installed at the LBT. The laser units are located in the centre piece between the two mirrors on a dedicated platform. Leaving the laser systems, the beams are expanded with a refractive beam expander built into the LBT structure. The beams are directed behind the secondary mirror and sent to the sky by large flat mirrors. On the return path the photons are split off with a large dichroic mirror, which sends the light to the wavefront sensor. Calibration light sources and optics mounted on swing arms can be moved into the Gregorian prime focus for the adaptive optics calibration. A total of eight electronics racks host the required infrastructure of drivers, readout, and controllers.
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