Generalised Phase Diversity Wavefront Sensor

Abstract

Phase-Diversity is an algorithm for reconstruction of wavefront phase from data corresponding to images of the input wavefront intensity on two planes normal to the direction of propagation and located at different positions along the axis of propagation. These planes are generally described as symmetrically placed about the image plane, but can equally well be symmetrically placed about the system input pupil. In this case the phase diversity algorithm becomes essentially the same as the wavefront curvature algorithm. For reconstruction of the wavefront phase the inverse problem is presented in terms of the differential Intensity Transport Equation and solved either iteratively or through use of Green's functions. Here we will explore what other aberrations, other than defocus, can be used in a generalised phase diversity wavefront reconstruction. The possible advantages of this approach will be considered.