Laser modulation to reduce the dependence on natural guide star for focus sensing: simulations and preliminary results

The adaptive optics (AO) system requires natural guide stars (NGS) to differentiate the focus error generated due to vertical shift in the sodium centroid altitude together with atmospheric turbulence. This dependency on NGS restricts achieving useable sky coverage and AO operation during dawn. One of the proposed approaches to distinguish these two focus errors is to monitor continuously the region of the sodium layer where the LGS is generated. The classical approaches used for this task, direct imaging, and LIDAR technology, have limitations. The technique of continuously amplitude modulating the guidestar laser (GSL) according to the pseudo-random binary sequence (PRBS) has the potential to overcome the limitations of classical approaches and reduce the dependency of the AO system on the NGS. The focus error is the major issue in large telescopes; therefore, we extended the PRBS technique to one of the large telescopes, the Gaint Magellan Telescope through numerical simulations. The study shows that modulation strength of 0.47 is required to fulfil the requirements during high sodium column density. Previously, it was intended to experimentally verify the technique with an LGS facility installed at the 1.8 m EOS telescope, Mount Stromlo, Canberra, Australia. Due to unavoidable circumstances, we now intend to perform the experiment with the LGS facility at the 2.3 m ANU telescope, Siding Spring Observatory (SSO), Coonabarabran, Australia. The paper presents the numerical simulations conducted with parameters of SSO, hardware selection for the experiment based on the system requirements, and preliminary test results from the laboratory.