Fig. 2
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Detailed view of the degeneracy problem for even radial orders (n) at focal plane. Top panel: aberrations induced by even radial-order Zernike with n = 2 (Z4, Z5, Z6). Bottom panel: aberrations induced by odd radial-order Zernike with n = 3 (Z7, Z8, Z9). Top rows: wave-front OPD at pupil. Centre rows: focal-plane images of aberrated PSFs. Bottom rows: extra-focal-plane images,obtained with 10 mm of defocus on an f/25 beam. The removal of the degeneracy is evident in each extra focal image (the WFE amplitude was always 50 nm RMS).
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