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Multiple-frequency imaging using a terahertz quantum cascade laser

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6 Author(s)
Nor Kamilah Saat ; School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UK ; Paul Dean ; Suraj P. Khanna ; Mohamed Salih
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We describe a multiple-frequency imaging system based on an electrically-tunable terahertz (THz) frequency quantum cascade laser (QCL). The transverse resolution of the system was measured using gold-on-quartz resolution targets, and shown to remain unchanged as the radiation wavelength increased. This was explained through measurement of the far-field emission profile of the QCL. Using this imaging system we determined the attenuation coefficients of the high-explosive pentaerythritol tetranitrate (PETN), together with a number of other polycrystalline materials, at five frequencies, and compared these results with those obtained using both THz time domain spectroscopy and high-resolution Fourier-transform infrared spectroscopy.

Published in:

35th International Conference on Infrared, Millimeter, and Terahertz Waves

Date of Conference:

5-10 Sept. 2010