Title :
Fast terahertz imaging with a quantum-cascade laser and a scanning mirror
Author :
Rothbart, N. ; Richter, H. ; Wienold, M. ; Schrottke, L. ; Giehler, M. ; Hey, R. ; Grahn, H.T. ; Hübers, H. -W
Author_Institution :
Inst. of Planetary Res., German Aerosp. Center (DLR), Berlin, Germany
Abstract :
A terahertz imaging system based on a quantum-cascade laser, a fast scanning mirror, and a Ge:Ga detector is demonstrated. Transmission images are obtained by scanning the beam of the quantum-cascade laser across an object. Images with a diameter of approximately 45 mm and a signal-to-noise ratio of approximately 25 dB were obtained within 1.1 s. The system was also used to obtain three-dimensional images by computed tomography within an acquisition time of 87 s.
Keywords :
elemental semiconductors; gallium; germanium; image processing; mirrors; quantum cascade lasers; terahertz wave imaging; Ge:Ga; Ge:Ga detector; computed tomography; fast scanning mirror; fast terahertz imaging; quantum-cascade laser; signal-to-noise ratio; terahertz imaging system; three-dimensional images; time 1.1 s; time 87 s; transmission images; Computed tomography; Detectors; Laser beams; Mirrors; Quantum cascade lasers; Signal to noise ratio;
Conference_Titel :
Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 2012 37th International Conference on
Conference_Location :
Wollongong, NSW
Print_ISBN :
978-1-4673-1598-2
Electronic_ISBN :
2162-2027
DOI :
10.1109/IRMMW-THz.2012.6380324
