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http://hdl.handle.net/20.500.12386/29404
Title: | Exploiting the pyramid WFS gain using a deformable lens as an NCPA corrector | Authors: | BERGOMI, Maria Quintavalla, Martino Magrin, D. Bonora, Stefano RAGAZZONI, Roberto Arcidiacono, C. Pinna, E. |
Issue Date: | 2019 | Volume: | AO4ELT6 Conference Proceedings | Abstract: | Pyramid wavefront sensors are widely used in adaptive optics systems, due to their advantages in terms of sensitivity with respect to other wavefront sensors such as the Shack-Hartmann. However, especially in extreme adaptive optics applications, Non-Common Path Aberration (NCPAs) cause image distortions that can hinder the scientific throughput. NCPAs are usually corrected introducing offsets on the pyramid closed-loop control systems, but the consequent increase in the size of the star image on the pyramid pin leads to a decrease in sensitivity that compromises the aforementioned advantages. In principle, these offsets can be counter-balanced by introducing an active optical element in the wavefront sensing channel, recovering the full sensitivity of the pyramid. In this framework, we are studying the capability of Multi-Actuator deformable Lenses to recover such NCPAs. We present in this paper the result obtained on the test-bench that has been realized at CNR-IFN Institute in Padova, with the collaboration of INAF-Padova, aiming at the NCPAs correction by the means of a multi-actuator deformable lens inserted in the sensing path, in order to recover the optimal working conditions and the ideal magnitude gain of the pyramid. | Conference Name: | Adaptive Optics for Extremely Large Telescopes (AO4ELT6) | Conference Place: | Quebec City, Quebec, Canada | Conference Date: | 9-14 June, 2019 | URI: | http://hdl.handle.net/20.500.12386/29404 | URL: | http://ao4elt6.copl.ulaval.ca/ http://ao4elt6.copl.ulaval.ca/proceedings.html |
Fulltext: | open |
Appears in Collections: | 3.01 Contributi in Atti di convegno |
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