Direct wavefront sensing from extended objects: a general sensor

Wavefront sensing from an extended object is a challenging task since the\nphase to be sensed is disturbed by the phase generated from the structure of\nthe extended object. To address this problem, a general wavefront sensor was\nproposed. The hardware of the sensor consists of a field lens, a collimating\nlens, a lenslet array, and a camera. The idea for its algorithm is to eliminate\nthe phase caused by the extended object and reconstruct the point spread\nfunction through each lenslet. As a result, the scenario of wavefront sensing\nfrom an extended object has been converted to the conventional one from a point\nsource. Numerical simulations and experiments both verify the feasibility and\nthe accuracy of the proposed sensor.\n