Ptychography reconstruction of Diamond CRLs phase profile

We will use diamond CRLs to focus the beam down to a size of several hundreds of nanometers at the sample position. Using a siemen star in forward goemetry, we will make the ptychography reconstruction of the beam profile at the focal. Propagating back this beam to the CRLs position, we will have the CRLs phase profile and compute the phase error associated to the stack of CRLs.