System and method for recovering phase information of a wave front

(57) The system and method for the recovery of the phase information from a concentration value by which summary record was carried out are indicated. It is arranged at the back focal plain (BFP) (230) of lenses (210) used in order that a phase filter (230) may observe an object, such as one or more Dioptrie lenses. A phase filter (230) is a known method and changes the phase of the wavefront distribution in BFP. The phase filter (230) in which N differs or the phase distribution of N electronically generated with a variable phase filter (230) is used for the above-mentioned system, and it catches the concentration data of a group in which N in the image surface (IP) and (240) differs. The concentration image of N is used in order to obtain evaluation of the wave face in BFP of a lens. Used in order that this BFP wave face evaluation may generate the evaluation by which N of the wave face in IP was changed, each of the changed evaluation corresponds to one of the phase distribution of N of a BFP phase filter (230). In one mounting, IP evaluation by which N was changed is rectified by replacing the evaluated amplitude with the amplitude actually measured about the above-mentioned image. The above-mentioned processing is repeated until the error measurement between the measured value and the thing generated in composition comes below a known threshold value. Individual concentration measurement of the wave face in BFP can be used in order to gather the speed of convergence of the above-mentioned processing. Phase evaluation of the result can be used in order that appearance may display the wave face information similar to a hologram.