Calibrating a high-resolution wavefront corrector with a static focal-plane camera

摘要

We present a method to calibrate a high-resolution wavefront-correctingdevice with a single, static camera, located in the focal plane; no moving ofany component is needed. The method is based on a localized diversity anddifferential optical transfer functions (dOTF) to compute both the phase andamplitude in the pupil plane located upstream of the last imaging optics. Anexperiment with a spatial light modulator shows that the calibration issufficient to robustly operate a focal-plane wavefront sensing algorithmcontrolling a wavefront corrector with ~40 000 degrees of freedom. We estimatethat the locations of identical wavefront corrector elements are determinedwith a spatial resolution of 0.3% compared to the pupil diameter.