The linearity and accuracy of holography-based modal wavefront sensing (HMWS) is reduced when large aberrations are present in the incoming wavefront. In this contribution, a combination of HMWS and a low-resolution Shack- Hartmann sensor (LRSHS) is introduced to extend the dynamic range of HMWS via a compact holographic design. The typically dominating low-order modes in the incoming wavefront are first corrected by the LRSHS. The system then switches to HMWS after one or two corrections to obtain better sensor sensitivity and accuracy. First experimental results are shown for validating the method.

Date Published: 13 September 2012
PDF: 12 pages
Proc. SPIE 8447, Adaptive Optics Systems III, 84473Y (13 September 2012);

Published in SPIE Proceedings Vol. 8447:
Adaptive Optics Systems III
Brent L. Ellerbroek; Enrico Marchetti; Jean-Pierre Véran, Editor(s)