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Proceedings Paper

Widely tunable terahertz-wave generation using LiNbO3 optical parametric oscillator and its application to differential imaging
Author(s): Kodo Kawase; Junichi Shikata; Tetsuo Taniuchi; Hiromasa Ito
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Paper Abstract

We had recently demonstrated a room temperature operated widely tunable THz-wave generation (frequency: 0.9 - 2.1 THz, wavelength: 140 - 310 micrometer) introducing a Si prism coupler onto a LiNbO3 crystal which was pumped by a Q- switched Nd:YAG laser. The process involved is an optical parametric oscillation (OPO) utilizing the polariton mode scattering of LiNbO3. This tunable THz-wave source was applied to the problem of differential imaging. In a proof-of- concept experiment, we optically tagged objects embedded in a shade and measured the difference between transmittance at two wavelengths. The image of a tagged object was emphasized in comparison with that of an untagged objects. Differential THz imaging has not been reported previously, to our knowledge, mainly because of the lack of convenient tunable THz-wave sources. It seems possible to use dual-wavelength differential transmittance spectroscopy in the THz-wave region to monitor the gases in the industry.

Paper Details

Date Published: 13 November 1998
PDF: 7 pages
Proc. SPIE 3465, Millimeter and Submillimeter Waves IV, (13 November 1998); doi: 10.1117/12.331155
Show Author Affiliations
Kodo Kawase, Tohoku Gakuin Univ. (Japan)
Junichi Shikata, Tohoku Univ. (Japan)
Tetsuo Taniuchi, Tohoku Univ. (Japan)
Hiromasa Ito, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 3465:
Millimeter and Submillimeter Waves IV
Mohammed N. Afsar, Editor(s)

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