Using a static phase-only pupil-plane element we create holographic copies of the point spread function (PSF), each superimposed with a certain pupil-plane phase probe. We therefore obtain all intensity images simultaneously while still retaining a central, unaltered science PSF. The electric field sensing method only makes use of the holographic copies, allowing for correction of the residual electric field while retaining the central PSF for uninterrupted science data collection. In this paper we demonstrate the feasibility of this method with numerical simulations.
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Emiel H. Por, Christoph U. Keller, "Focal-plane electric field sensing with pupil-plane holograms," Proc. SPIE 9909, Adaptive Optics Systems V, 990959 (27 July 2016);