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Proceedings Paper

Imaging at 0.2 and 2.5 terahertz
Author(s): Arline M. Melo; Mauricio A. P. Toledo; Francisco C. B. Maia; Andre Rocha; Matheus B. Plotegher; Daniel Pereira; Flavio C. Cruz
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Paper Abstract

We report the development and initial results of two Terahertz imaging systems based on monochromatic sources at 0.2 and 2.52 THz. The first is based on a microwave oscillator, whose frequency is multiplied to 0.2 THz, used in conjunction with a zero-bias detector. The sample is scanned across the beam, and transmission images are obtained after processing. The second system allows real-time images, and consists of a methanol gas laser emitting at 119 microns (2.52 THz) and a commercial camera based on a microbolometer array. We describe the construction and performance of the methanol laser and a tunable CO2 laser, which emits 20 W at the 9P(36) pump line. Due to the high coherence of the laser, this system is particularly suited for diffraction and interference imaging. We have measured the absorption coefficients of a few samples assuming the Beer law.

Paper Details

Date Published: 27 March 2013
PDF: 6 pages
Proc. SPIE 8624, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VI, 86240E (27 March 2013); doi: 10.1117/12.2002108
Show Author Affiliations
Arline M. Melo, BR Labs. (Brazil)
Mauricio A. P. Toledo, Univ. Estadual de Campinas (Brazil)
Francisco C. B. Maia, BR Labs. (Brazil)
Andre Rocha, BR Labs. (Brazil)
Matheus B. Plotegher, BR Labs. (Brazil)
Daniel Pereira, Univ. Estadual de Campinas (Brazil)
Flavio C. Cruz, Univ. Estadual de Campinas (Brazil)

Published in SPIE Proceedings Vol. 8624:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VI
Laurence P. Sadwick; Créidhe M. O'Sullivan, Editor(s)

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