Advanced Rayleigh guided Ground layer adaptive Optics System
The ARGOS project equips the LBT, the Large Binocular Telescope, with an up to date laser guide star and wavefront sensing facility. ARGOS utilizes multiple pulsed lasers to generate artificial guide stars. A total of six laser guide stars are used to correct the ground layer turbulence above each of the LBT mirrors. The primary goal of the facility is to correct the atmospheric turbulence induced distortions, thus enhancing the imaging and spectroscopic capabilities for LUCI over a wide field of view. In contrast to usual single conjugated adaptive optics, ARGOS does not reach to the diffraction limit of the telescope. But it will be capable to reduce the seeing by a factor of 2-3 over a 4 arcmin field of view.
The system consists of:
- Laser systems, each of them containing three powerful pulsed green lasers
- Beam expanders to enlarge the lasers to a 40cm diameter and project them to sky
- Wavefront sensors to detect the backscattered light from the beacons
- The adaptive optics control of LBT’s deformable secondary mirrors