Mid-IR and terahertz digital holography based on quantum cascade lasers

M. Ravaro; M. Locatelli; E. Pugliese; M. Siciliani de Cumis; F. D'Amato; L. Consolino; S. Bartalini; M. S. Vitiello; P. De Natale

doi:10.1117/12.2079221

8 February 2015 Mid-IR and terahertz digital holography based on quantum cascade lasers

M. Ravaro, M. Locatelli, E. Pugliese, M. Siciliani de Cumis, F. D'Amato, L. Consolino, S. Bartalini, M. S. Vitiello, P. De Natale

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Proceedings Volume 9370, Quantum Sensing and Nanophotonic Devices XII; 93701F (2015) https://doi.org/10.1117/12.2079221
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

Infrared (IR) digital holography (DH) based on CO₂ lasers has proven to be a powerful coherent imaging technique due to the reduced sensitivity to mechanical vibrations, to the increased field of view, to the high optical power and to possible vision through scattering media, such as smoke. In this contribution we report IR DH based on the combination of quantum cascade laser (QCL) sources and a high resolution microbolometric camera. QCLs combine highly desirable features for coherent imaging, such as compactness, high optical power, and spectral purity. The present availability of external cavity mounted QCLs having a broad tuning range, makes them suitable sources for multiple wavelength holographic interferometry. In addition, QCL emission covers several windows throughout a large portion of the IR spectrum, from the mid-IR to the terahertz region. This allows taking advantage of the different optical response of the imaged objects at different frequencies, which is crucial for applications such as non-destructive testing and biomedical imaging. Our holographic system is suitable for the acquisition of both transmission holograms of transparent objects and speckle holograms of scattering objects, which can be processed in real time to retrieve both amplitude and phase.

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M. Ravaro, M. Locatelli, E. Pugliese, M. Siciliani de Cumis, F. D'Amato, L. Consolino, S. Bartalini, M. S. Vitiello, and P. De Natale "Mid-IR and terahertz digital holography based on quantum cascade lasers", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93701F (8 February 2015); https://doi.org/10.1117/12.2079221

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KEYWORDS

Quantum cascade lasers

Holograms

Terahertz radiation

Digital holography

Mid-IR

Infrared imaging

Holographic interferometry

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