Title :
Applications & early results from THz heterodyne imaging at 119 μm
Author :
Siegel, Peter H. ; Dengler, Robert J.
Author_Institution :
Beckman Inst., California Inst. of Technol., Pasadena, CA, USA
fDate :
27 Sept.-1 Oct. 2004
Abstract :
The authors present a description and early measurement results from a unique CW terahertz heterodyne imaging system based around two custom fabricated 2.5 THz planar Schottky diode mixers and two commercially available optically pumped far IR lasers. One laser is used for the signal beam and supplies as much as 70 mW at 2.5 THz. The other laser acts as a local oscillator source for the two mixers. The system uses the second THz mixer, a low frequency reference oscillator and a lock-in amplifier to monitor and normalise the two lasers. The system has been employed on both biological tissues as well as materials of interest to NASA space science applications. The instrumentation is briefly described and some representative images is also presented.
Keywords :
Schottky diode mixers; biological tissues; heterodyne detection; submillimetre wave detectors; submillimetre wave imaging; submillimetre wave lasers; submillimetre wave mixers; submillimetre wave oscillators; 119 micron; 2.5 THz; 70 mW; CW heterodyne imaging system; NASA space science applications; THz mixer; biological tissues; local oscillator source; lock-in amplifier; low frequency reference oscillator; optically pumped far IR laser; planar Schottky diode mixers; terahertz heterodyne imaging; Biomedical optical imaging; Laser beams; Laser excitation; Local oscillators; Optical imaging; Optical mixing; Optical pumping; Pump lasers; Schottky diodes; Submillimeter wave measurements;
Conference_Titel :
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on
Print_ISBN :
0-7803-8490-3
DOI :
10.1109/ICIMW.2004.1422210
