Laboratory testing of the Ingot WFS

Simone Di Filippo; Davide Greggio; Maria Bergomi; Kalyan Kumar Radhakrishnan Santhakumari; Elisa Portaluri; Carmelo Arcidiacono; Valentina Viotto; Roberto Ragazzoni; Marco Dima; Luca Marafatto; Jacopo Farinato; Demetrio Magrin

doi:10.1117/12.2629355

29 August 2022 Laboratory testing of the Ingot WFS

Simone Di Filippo, Davide Greggio, Maria Bergomi, Kalyan Kumar Radhakrishnan Santhakumari, Elisa Portaluri, Carmelo Arcidiacono, Valentina Viotto, Roberto Ragazzoni, Marco Dima, Luca Marafatto, Jacopo Farinato, Demetrio Magrin

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121854V (2022) https://doi.org/10.1117/12.2629355
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The ingot WFS is a new kind of wavefront sensor specifically designed to deal with the elongation of LGS reference sources on ELT-class telescopes. Like the pyramid, it belongs to the family of pupil plane wavefront sensors and can be considered as a generalization of the pyramid WFS for extended, three-dimensional elongated sources. The current design uses a simple, reflective roof-shaped prism to split the light into three pupils that are used to retrieve the wavefront shape. A test-bench has been realized at the INAF-Padova laboratories to test the alignment and functioning of the ingot. The bench is equipped with a deformable lens, conjugated to the pupil plane, able to apply low-order aberrations and with a hexapod for the precise alignment of the ingot prism. In this work we present a robust and fully automated Python-code alignment procedure, which is able, by using the optical feedback from the I-WFS, to adjust its 6-degrees of freedom. Moreover, we report on the tests conducted with the deformable lens to characterize the ingot WFS response to low-order aberrations in terms of sensitivity and linearity. The results are used as a comparison for simulations to validate the ray-tracing modeling approach with the future goal of optimizing the procedure adopted for signal calculation and phase retrieval.

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Simone Di Filippo, Davide Greggio, Maria Bergomi, Kalyan Kumar Radhakrishnan Santhakumari, Elisa Portaluri, Carmelo Arcidiacono, Valentina Viotto, Roberto Ragazzoni, Marco Dima, Luca Marafatto, Jacopo Farinato, and Demetrio Magrin "Laboratory testing of the Ingot WFS", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121854V (29 August 2022); https://doi.org/10.1117/12.2629355

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