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Phase-Sensitive Reflective Imaging Device in the mm-wave and Terahertz Regions

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Abstract

Two Free Electron Laser sources have been developed at ENEA-Frascati for a variety of applications: A Compact Free Electron Laser (C-FEL) that provides coherent radiation in the frequency range between 90 and 150 GHz Gallerano et al. (Infrared Phys. and Techn. 40:161, 1999), and a second source, FEL-CATS, which utilizes a peculiar radio-frequency structure to generate coherent emission in the range 0.4 to 0.7 THz Doria et al. (Phys. Rev. Lett 93:264801, 2004). The high peak power of several kW in 15 to 50 ps pulses, makes these sources particularly suitable for the assessment of exposure limits in biological systems and for long range detection. In this paper we present a phase-sensitive reflective imaging device in the mm-wave and THz regions, which has proven to be a valuable tool in the biological Ramundo-Orlando et al. (Bioelectromagnetics 28:587–598, 2007), environmental Doria et al. (2005) and art conservation fields Gallerano et al. (2008). Different setups have been tested at different levels of spatial resolution to image objects from a few centimeter square to larger sizes. Images have been compared to identify and characterize the contrast mechanism.

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Acknowledgments

We gratefully acknowledge the contribution of L. d’Aquino at ENEA-Portici and A. Lai at ENEA-Frascati in defining the requirements of THz imaging in environmental studies. We acknowledge the effort of K. Fukunaga of NICT-Tokyo in devoting her skill to the THz-ARTE collaboration.

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Authors and Affiliations

  1. ENEA–Dipartimento Tecnologie Fisiche e Nuovi Materiali, 00044, Frascati, Italy

    Gian Piero Gallerano, Andrea Doria, Marzia Germini, Emilio Giovenale, Giovanni Messina & Ivan P. Spassovsky

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  1. Gian Piero Gallerano
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  2. Andrea Doria
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  3. Marzia Germini
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  4. Emilio Giovenale
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  5. Giovanni Messina
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  6. Ivan P. Spassovsky
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Correspondence to Gian Piero Gallerano.

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Gallerano, G.P., Doria, A., Germini, M. et al. Phase-Sensitive Reflective Imaging Device in the mm-wave and Terahertz Regions. J Infrared Milli Terahz Waves 30, 1351–1361 (2009). https://doi.org/10.1007/s10762-009-9560-0

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  • DOI: https://doi.org/10.1007/s10762-009-9560-0

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