Dr Rigaut main theoretical contributions include the proposal and first paper describing Ground Layer AO, the proposal and the principle description of Fourier modelling of AO systems and the first quantification of the Tip-Tilt indetermination problem associated with the use of LGS, together with an analitycal derivation of the noise in Shack-Hartmann Wavefront sensors. Research interests Adaptive Optics concepts & implementation Adaptive Optics diversification, application to health sciences Astronomical instrumentation New wavefront sensor concepts Space debris tracking and removal Affordable adaptive optics systems