The Ingot WFS was designed to overcome some of the challenges present in classical wavefront sensors when they deal with sodium LGSs. This innovative sensor works by sensing the full 3D volume of the elongated LGS and is suitable for use in very large telescopes. A test bench has been assembled at the INAF, Osservatorio Astronomico di Padova laboratories to test and characterize the functioning of the Ingot WFS. In this work, we summarize the main results of the tests performed on a new search algorithm. Then, we move towards a more accurate simulation of the sodium LGS by replicating real time-varying sodium layer profiles. The study of their impact on the ingot pupil signals is described in this work.
The narrow-band filters, based on thin layers of dielectric material, presents a blue shift of the transmission curve with larger angles from the normal. Fast and large field-of-view instruments limit the ability of such filters to select small spectral features that can highlight multiple star populations in globular clusters.
We hope to transform an instrument like the first-focus one of the LBT into the spearhead facility to identify the multiple populations in galactic globular clusters from the ground.
A new set of simulations has been developed to identify the best thin-layer filter to be used in order to separate populations with different light element abundances. We also built an optomechanical set-up to test the filter behavior in a LBC-like configuration. We present here the simulation strategy and some transmission curve obtained with the laboratory set-up.
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