Characterization of the Performance of a 7-Mirror Segmented Reflecting Telescope via the Angular Spectrum Method
A segmented reflecting telescope made of seven 76 mm concave mirrors, each with a focal length of 300 mm, was characterized. Its performance was evaluated by computing the point spread function (PSF) and comparing it to an equivalent monolithic mirror. Aberrations were added and corrected using a phase retrieval technique called the Gerchberg-Saxton (GS) algorithm to obtain the correction phase that serves as the input to the spatial light modulator (SLM). Results revealed an improvement in the telescope angular resolution as a result of the implemented phase correction. It was also shown that the PSF varies depending on the orientation and number of mirrors added.
KeywordsPoint spread function Segmented reflecting telescope Gerchberg-Saxton Phase retrieval
This work was done at the National Institute of Physics, University of the Philippines, Diliman, Quezon City. It was made possible by the support from the DOST PCIEERD Standards and Testing Automated Modular Platform (STAMP) project (03439), the University of the Philippines Office of the Vice President for Academic Affairs EIDR-VISSER::SM project (C02-001) and the UP System Enhanced Creative Work and Research Grant (ECWRG 2014-11). It was also partly funded by the UP OVPAA ECWRG. GT and MAA would like to thank Dr. Paul Leonard Hilario and Dr. Caesar Saloma for their invaluable advice in this work.
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