28 June 2006 Multiconjugated adaptive optics for ELTs: an enhancement of the PIGS setup
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ELTs depend on Adaptive Optics (AO) to reach the diffraction limit. To achieve sufficient sky coverage with AO, several Laser Guide Stars (LGS) will be needed, but the finite distance of the LGSs introduces optical problems which can not be solved easily, especially at telescopes with a diameter larger than 30m. PIGS (Pseudo Infinite Guide Star) is a novel sensing technique proposed to overcome some of these problems by using a slit mask and a reflective rod measuring in radial and azimuthal direction the wavefront abberations. The sensor was already demonstrated with a single LGS in laboratory and on sky. Currently we investigate the PIGS concept in a MCAO (Multi Conjugated Adaptive Optics) fashion by building a test setup in the laboratory. MCAO will solve the cone effect, one of the remaining problems with PIGS. The PIGS MCAO experiment goals on engineering problems and demonstration of the layer orientated concept with the PIGS technique. The PIGS concept and its extension to MCAO will be described and preliminary results presented.
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E. Meyer, E. Meyer, W. Gaessler, W. Gaessler, S. A. Kellner, S. A. Kellner, E. Diolaiti, E. Diolaiti, S. Egner, S. Egner, R. Ragazzoni, R. Ragazzoni, J. Farinato, J. Farinato, "Multiconjugated adaptive optics for ELTs: an enhancement of the PIGS setup", Proc. SPIE 6272, Advances in Adaptive Optics II, 62723Q (28 June 2006); doi: 10.1117/12.671365; https://doi.org/10.1117/12.671365

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