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Proceedings Paper

Dual-wavelength THz imaging with quantum cascade lasers
Author(s): Danielle R. Chamberlin; Peter R. Robrish; William R. Trutna; Giacomo Scalari; Marcella Giovannini; Lassaad Ajili; Jerome Faist; Harvey E. Beere; David A. Ritchie
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Paper Abstract

We have assembled an imaging system using quantum cascade lasers at frequencies of both 3.4 and 2.3 THz. Images at the two frequencies and the resulting absorption coefficients are compared. We demonstrate imaging in both reflection and transmission. The lasers are operated in a closed-cycle refrigerator and we use a peak output power of >2.5 mW at 7-10% duty cycle and 22-40 K operating temperature. The focal spot size is approximately 300 microns for both lasers and is not diffraction-limited. The signal is detected with a single-element DTGS detector, and images are captured by scanning the sample. Applications enabled by longer wavelengths are demonstrated, as well as the determination of chemical information through imaging at two wavelengths.

Paper Details

Date Published: 25 March 2005
PDF: 8 pages
Proc. SPIE 5727, Terahertz and Gigahertz Electronics and Photonics IV, (25 March 2005); doi: 10.1117/12.589476
Show Author Affiliations
Danielle R. Chamberlin, Agilent Labs. (United States)
Peter R. Robrish, Agilent Labs. (United States)
William R. Trutna, Agilent Labs. (United States)
Giacomo Scalari, Univ. of Neuchatel (Switzerland)
Marcella Giovannini, Univ. of Neuchatel (Switzerland)
Lassaad Ajili, Univ. of Neuchatel (Switzerland)
Jerome Faist, Univ. of Neuchatel (Switzerland)
Harvey E. Beere, Cavendish Lab./Univ. of Cambridge (United Kingdom)
David A. Ritchie, Cavendish Lab./Univ. of Cambridge (United Kingdom)


Published in SPIE Proceedings Vol. 5727:
Terahertz and Gigahertz Electronics and Photonics IV
R. Jennifer Hwu; Kurt J. Linden, Editor(s)

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