Referenceless selectogram and its properties
- Vavilov State Optical Institute, St. Petersburg (Russian Federation)
A method for recording and reconstruction of three-dimensional images of objects using the so-called referenceless selectogram is proposed. In line with this method, the radiation scattered by an object is filtered by a horizontal slit and then split into two components using a diffraction grating that is placed immediately adjacent to a thick photosensitive medium. The interference pattern resulting from the interaction of components formed by the grating is recorded by a photosensitive layer in the form of a three-dimensional deep hologram. It is shown that the selectogram thus recorded may be put in correspondence with a window or a pupil through which must pass radiation used in its reconstruction. Thus, the pupil is represented by one of the virtual images formed by the grating at the stage of recording. The radiation passing through the pupil may have an arbitrary amplitude and phase distribution. In accordance with this property, the selectogram can be reconstructed using radiation scattered by a diffuse screen placed in the pupil of the system. Processes of recording and reconstruction of a selectogram are analyzed for the cases where recording is performed in coherent and incoherent light. It is shown that, in the case where a selectogram is recorded using coherent radiation, the wave field of radiation reconstructed by it reproduces the wave field of radiation within a certain random phase shift. In the case where recording is carried out using incoherent radiation, phases of points of the reconstructed image coincide with phases of points of the diffuser used for selectogram reconstruction and the intensity distribution is distorted to some extent. It is shown that the structure of a three-dimensional lologram recorded by the axial point of an object is independent of the wavelength because of the achromatic effect of a diffraction grating.
- OSTI ID:
- 393882
- Journal Information:
- Optics and Spectroscopy, Journal Name: Optics and Spectroscopy Journal Issue: 5 Vol. 79; ISSN OPSUA3; ISSN 0030-400X
- Country of Publication:
- United States
- Language:
- English
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