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25 March 2005 Dual-wavelength THz imaging with quantum cascade lasers
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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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Danielle R. Chamberlin, Peter R. Robrish, William R. Trutna Jr., Giacomo Scalari, Marcella Giovannini, Lassaad Ajili, Jerome Faist, Harvey E. Beere, and David A. Ritchie "Dual-wavelength THz imaging with quantum cascade lasers", Proc. SPIE 5727, Terahertz and Gigahertz Electronics and Photonics IV, (25 March 2005);


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