Portal de Periódicos da CAPES

Twin-image elimination in in-line holography of finite-support complex objects

1991; Optica Publishing Group; Volume: 16; Issue: 24 Linguagem: Inglês

10.1364/ol.16.001979

1539-4794

Gabriel Koren, F. Polack, D. Joyeux,

Advanced Optical Imaging Technologies

Reconstruction of in-line holograms suffers from the superposition of two twin images having different foci but identical information content. A simple iterative method of twin-image elimination is presented here. It is based on the fact that, if the object has a finite support and the recording distance is not too small, the out-of-focus field is known on a large part of the reconstruction plane and is only superposed by the in-focus one inside a restricted support. An iterative procedure is developed to recover the out-of-focus wave inside the in-focus image support. Inverse diffraction then gives the reconstructed image. This procedure can be easily auto-mated and works for finite-support real or complex objects, recorded in geometries with a Fresnel number of ~1.