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Proceedings Paper

THz-wave parametric sources and imaging applications
Author(s): Kodo Kawase
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Paper Abstract

We have studied the generation of terahertz (THz) waves by optical parametric processes based on laser light scattering from the polariton mode of nonlinear crystals. Using parametric oscillation of MgO-doped LiNbO3 crystal pumped by a nano-second Q-switched Nd:YAG laser, we have realized a widely tunable coherent THz-wave sources with a simple configuration. We have also developed a novel basic technology for THz imaging, which allows detection and identification of chemicals by introducing the component spatial pattern analysis. The spatial distributions of the chemicals were obtained from terahertz multispectral trasillumination images, using absorption spectra previously measured with a widely tunable THz-wave parametric oscillator. Further we have applied this technique to the detection and identification of illicit drugs concealed in envelopes. The samples we used were methamphetamine and MDMA, two of the most widely consumed illegal drugs in Japan, and aspirin as a reference.

Paper Details

Date Published: 23 December 2004
PDF: 8 pages
Proc. SPIE 5620, Solid State Laser Technologies and Femtosecond Phenomena, (23 December 2004); doi: 10.1117/12.578434
Show Author Affiliations
Kodo Kawase, RIKEN-The Institute of Physical and Chemical Research (Japan)
Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 5620:
Solid State Laser Technologies and Femtosecond Phenomena
Jonathan A. C. Terry; W. Andrew Clarkson, Editor(s)

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