Ptychographic wavefront cameras

We introduce a snapshot wavefront camera capable of reconstructing the complex field of an object with near quantum-limited accuracy. This system incorporates a diffraction grating at the entrance aperture and an array of cameras positioned to align with the grating orders, capturing the field with varying impulse responses. The camera effectively reconstructs both the amplitude and phase of the object. Key performance factors include the aperture size, the number of apertures, and the overlap ratio between adjacent apertures. The minimal imaging and computational performance could be obtained using a 3 × 3 camera array configuration.