Title :
Fast 2-D and 3-D Terahertz Imaging With a Quantum-Cascade Laser and a Scanning Mirror
Author :
Rothbart, N. ; Richter, H. ; Wienold, M. ; Schrottke, L. ; Grahn, H.T. ; Hubers, Heinz-Wilhelm
Author_Institution :
Inst. of Planetary Res., German Aerosp. Center (DLR), Berlin, Germany
Abstract :
A terahertz imaging system based on a quantum-cascade laser (QCL), a fast scanning mirror, and a sensitive Ge:Ga detector is demonstrated. Transmission images are obtained by scanning the beam of the QCL across an object. Images with a diameter of approximately 40 mm and a signal-to-noise ratio of up to 28 dB were obtained within 1.1 s. The system was also used to obtain three-dimensional images of objects in an ellipsoidal volume with axes of approximately 40 mm by computed tomography within 87 s.
Keywords :
computerised tomography; mirrors; photodetectors; quantum cascade lasers; terahertz wave detectors; terahertz wave imaging; computed tomography; ellipsoidal volume; fast 2D terahertz imaging; fast 3D terahertz imaging; fast scanning mirror; quantum-cascade laser; sensitive Ge:Ga detector; signal-to-noise ratio; time 1.1 s; time 87 s; transmission images; Computed tomography; Detectors; Lenses; Mirrors; Optical imaging; Quantum cascade lasers; Computed tomography; imaging; quantum-cascade laser (QCL); scanning mirror; terahertz (THz);
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2013.2273226
