Ingot wavefront sensor: from the Fourier End2End numerical simulation to the LOOPS test bench

Carmelo Arcidiacono, Simone Di Filippo, Davide Greggio, Kalyan Kumar Radhakrishnan Santakumari, Elisa Portaluri, Maria Bergomi, Valentina Viotto, Demetrio Magrin, Roberto Ragazzoni, Luca Marafatto, Marco Dima, Jacopo Farinato (+8 others)
2020 Adaptive Optics Systems VII  
The Sodium Laser Guide Star (LGS) is an elongated object in a 3D volume. This produces a significant elongation on many of the Shack-Hartmann wavefront sensor spots that the ELT instruments use for wavefront sensing. The Ingot Wavefront Sensor (I-WFS) has been proposed as a possible solution to deal with the 3D nature of the LGS. We developed an end-to-end numerical tool of the I-WFS to perform system analysis of a closed-loop complete system. We considered the generation of the input
more » ... , deformable mirror definition and control, and, of course details, of the I-WFS. It needs a 3-Dimensional description to fully take into account the elongation effect across the vertical (propagation) axis. The I-WFS has been simulated similarly to the Pyramid Wavefront Sensor, as a combination of Foucault knife-edge sensors. In parallel to numerical simulations development, we had the opportunity to perform laboratory testing of the I-WFS at the LOOPS Adaptive Optics test bench (at LAM), using a Spatial Light Modulator. This device is able to produce a high definition phase mask that can mimic two-dimensional I-WFS behaviour. In this framework, we report a preliminary discussion both for the simulations and the closed-loop data analysis.
doi:10.1117/12.2562355 fatcat:uaovmt3hbvgfljmmdngvvw6uq4