Reconstruction of the Complex Field of an Exit Wave of a Phase Object from Measurements at Different Distances

Improving the efficiency and expanding the scope of application of lensless optics require increasing its reliability in measuring light fields. The paper examines the complex field generated by a phase object, i.e., a lens. It is shown that reliable phase reconstruction is possible using two or more measurements of the intensity distribution at different distances from the object. A combination of a circular diaphragm and a lens located behind it is used as an object.