Mid-infrared digital holography and holographic interferometry with a tunable quantum cascade laser

Year: 2014

Authors: Ravaro M., Locatelli M., Pugliese E., Di Leo I., Siciliani de Cumis M., D’Amato F., Poggi P.,
Consolino L., Meucci R., Ferraro P., De Natale P.

Autors Affiliation: INO, Istituto Nazionale di Ottica—CNR, Largo E. Fermi 6, Firenze I-50125, Italy:
LENS, European Laboratory for NonLinear Spectroscopy, Via N. Carrara 1, Sesto Fiorentino (FI) I-50019, Italy;
INO, Istituto Nazionale di Ottica—CNR—Sezione di Napoli, Via Campi Flegrei, 34 80078 Pozzuoli (Napoli), Italy

Abstract: Mid-infrared digital holography based on CO2 lasers has proven to be a powerful coherent imaging technique due to reduced sensitivity to mechanical vibrations, increased field of view, high optical power, and possible vision through scattering media, e.g., smoke. Here we demonstrate a similar and more compact holographic system based on an external cavity quantum cascade laser emitting at 8 mu m. Such a setup, which includes a highly sensitive microbolometric camera, allows the acquisition of speckle holograms of scattering objects, which can be processed in real time. In addition, by exploiting the broad laser tunability, we can acquire holograms at different wavelengths, from which we extract phase images not subjected to phase wrapping, at synthetic wavelengths ranging from hundreds of micrometers to several millimeters. (C) 2014 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 39 (16)      Pages from: 4843  to: 4846

More Information: This work was partly supported by the Italian Ministry of Education, University and Research (MIUR) through the program \”FIRB-Futuro in Ricerca 2010\” RBFR10LULP.
KeyWords: Carbon dioxide; Computer generated holography; Holographic interferometry; Imaging techniques; Infrared devices; Quantum cascade lasers; Vibrations (mechanical); Coherent scattering; Computer generated holography; Holographic interferometry; Holography; Imaging techniques; Infrared devices; Laser recording; Quantum cascade lasers; Semiconductor lasers; Vibrations (mechanical), Digital holography; High optical power; Holographic system; Laser tunability; Reduced sensitivity; Scattering media; Scattering objects; Synthetic wavelength, Holograms; Holograms
DOI: 10.1364/OL.39.004843

Citations: 17
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