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Lensless zooming Fourier transform digital holography

Fernández Doval, Ángel ManuelAutor UVIGO; Trillo Yáñez, María CristinaAutor UVIGO; López Sánchez, ÓscarAutor UVIGO; Cernadas Fraga, Daniel CarlosAutor UVIGO; López Vázquez, José CarlosAutor UVIGO; Vázquez Dorrío, José BenitoAutor UVIGO; Fernández Fernández, José LuisAutor UVIGO; Perez-Martinez Perez-Amor, Mariano JesusAutor UVIGO
Date: 2003-05-27
UNIVERSAL IDENTIFIER: http://hdl.handle.net/11093/361
EDITED VERSION: http://proceedings.spiedigitallibrary.org/proceeding.aspx?articleid=888157
UNESCO SUBJECT: 3311.11 Instrumentos Opticos ; 2209.07 Holografía
DOCUMENT TYPE: conferenceObject

Abstract

Lensless Fourier-Transform Digital Holography through an aperture has been demonstrated some years ago. This technique allows to record and reconstruct images of large objects placed at short distances from the camera. In this paper we show that the distance between the aperture plane and the camera can be used to control the field of view and, therefore, moving the camera away from or towards the aperture has an effect similar to zooming a lens in and out, respectively. We also show that the F/# number of the aperture must be kept constant to hold the relative lateral resolution, i.e., to have a constant speckle size while zooming. With this improvement, Lensless Fourier-Transform Digital Holography provides a functionality similar to Image-Plane Digital Holography. Both involve practically the same computational cost. The former has the benefit of its experimental simplicity but has the drawback of not providing a real-time image of the object, which is useful for alignment, as the latter does.
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