Abstract
Widely tunable coherent terahertz (THz) wave generation was successfully demonstrated based on the laser light scattering from the lowest A1-symmetry polariton mode by using a Q-switched Nd: YAG laser pumping. This method exhibits multiple advantages like wide tunability (frequency: 0.9-2.2 THz), coherency and compactness of its system. In this paper, the general performances of this THz generator, and its applications are reported. A spectroscopic application is demonstrated by measuring the water vapor absorption. This THz-wave source is also applied to the 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.
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