Digital holography at 10.6 µm

Year: 2003

Authors: Allaria E., Brugioni S., De Nicola S., Ferraro P., Grilli S., Meucci R.

Autors Affiliation: Istituto di Ottica Applicata, Largo E. Fermi 6, 50125 Firenze, Italy;
Istituto di Cibernetica “E. Caianiello”, Via Campi Flegrei 34, Comprens. “A. Olivetti”, Fabbr. 70, 80078 Pozzuoli (NA), Italy;
Istituto per la Microelettronica e i Microsistemi, Sez. di Napoli, Via Diocleziano 328, 80124 Napoli, Italy;
Istituto di Ottica Applicata, Sez. di Napoli c/o Istituto di Cibernetica “E. Caianiello”, Via Campi Flegrei 34, Comprens. “A. Olivetti”, Fabbr. 70, 80078 Pozzuoli (NA), Italy

Abstract: Digital holography (DH) at the 10.6 lm of a CO2 laser can be successfully used to reconstruct numerically intensity and phase of the object wavefield. A Mach–Zehnder interferometer with a pyroelectric type optoelectronic sensor array is used to record digital off-axis Fresnel holograms of an extended object. We demonstrate that, although the pyrocamera spatial resolution is much less than that of typical detectors working in the visible spectral region, good intensity and phase reconstructions are provided. The principle of Fresnel reconstruction in DH is described and results of reconstruction process for object size of the order of 700 lm are presented and discussed. Furthermore we propose a method to accurately determine the wave vector components of the reference wavefield for off-axis DH set-up to obtain correct phase wavefield reconstruction.

Journal/Review: OPTICS COMMUNICATIONS

Volume: 215 (4-6)      Pages from: 257  to: 262

KeyWords: Algorithms; Carbon dioxide lasers; Interferometers; Optoelectronic devices, Digital holography, Holography
DOI: 10.1016/S0030-4018(02)02243-5

Citations: 62
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