Simultaneous estimation of segmented telescope phasing errors and non-common path aberrations from adaptive-optics-corrected images

ABSTRACT We investigate the focal plane wavefront sensing technique, known as Phase Diversity, at scientific of a segmented mirror telescope with an adaptive optics (AO) system. specifically consider optical system imaging point source in context (i) artificial within structure and (ii) from AO-corrected images bright star. From our simulations, we reliably disentangle phasing errors non-common path aberrations (NCPA) for both theoretical on-sky, where have simulated Keck/NIRC2 This quantification on-sky is appealing, it sensitive to cumulative perturbations entire train; disentanglement NCPA therefore critical, any potential correction primary estimate must contain minimal contributions. Our estimates require 1-min sequence short-exposure, images; by exploiting slight modification AO-loop, find that 75 defocused produce reliable estimates. demonstrate deformable results error reduction up 67 per cent 65 NCPA, respectively. If segment on Keck are order ∼130 nm RMS, show can improve H-band Strehl ratio 10 using algorithm. conclude technique works well alone images, suggesting promising method AO-system.