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Proceedings Paper

Lens less zooming fourier-transform digital holography
Author(s): Angel F. Doval; Cristina Trillo; Oscar Lopez; Daniel Cernadas; Carlos Lopez; Benito Vasquez Dorrio; Jose L. Fernandez; Mariano Perez-Amor
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Paper 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.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516617
Show Author Affiliations
Angel F. Doval, Univ. de Vigo (Spain)
Cristina Trillo, Univ. de Vigo (Spain)
Oscar Lopez, Univ. de Vigo (Spain)
Daniel Cernadas, Univ. de Vigo (Spain)
Carlos Lopez, Univ de Vigo (Spain)
Benito Vasquez Dorrio, Univ. de Vigo (Spain)
Jose L. Fernandez, Univ. de Vigo (Spain)
Mariano Perez-Amor, Univ. de Vigo (Spain)

Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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