Authors

S. Dandy, J.-F. Sauvage, T. Fusco, and L. Mugnier

Affiliations

ONERA

Abstract

Phase Diversity is a focal-plane technique which is chromatic by nature. The use of a monochromatic model on wide-band imaging results of an additional error function of the spectral range.We present here a second order modeling of the focal plane wave-front sensing error due to wide-band imaging and propose a first order correction by inverse problem using an iterative correction. Simulation and experimental results on the ONERA AO bench are presented. A nanometric accuracy is demonstrated for spectral band larger than a few hundreds micrometers.