Widely tunable terahertz-wave generation using LiNbO3 optical parametric oscillator and its application to differential imaging

Kodo Kawase; Junichi Shikata; Tetsuo Taniuchi; Hiromasa Ito

doi:10.1117/12.331155

13 November 1998 Widely tunable terahertz-wave generation using LiNbO₃ optical parametric oscillator and its application to differential imaging

Kodo Kawase, Junichi Shikata, Tetsuo Taniuchi, Hiromasa Ito

Author Affiliations +

Proceedings Volume 3465, Millimeter and Submillimeter Waves IV; (1998) https://doi.org/10.1117/12.331155
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

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.

Citation Download Citation

Kodo Kawase, Junichi Shikata, Tetsuo Taniuchi, and Hiromasa Ito "Widely tunable terahertz-wave generation using LiNbO₃ optical parametric oscillator and its application to differential imaging", Proc. SPIE 3465, Millimeter and Submillimeter Waves IV, (13 November 1998); https://doi.org/10.1117/12.331155

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