Abstract-Evaluation of polarized terahertz waves generated by Cherenkov phase matching

Takuya Akiba, Yasuhiro Akimoto, Koji Suizu, Katsuhiko Miyamoto, and Takashige Omatsu  »View Author Affiliations

Applied Optics, Vol. 53, Issue 8, pp. 1518-1522 (2014)
http://dx.doi.org/10.1364/AO.53.001518

http://www.opticsinfobase.org/ao/abstract.cfm?uri=ao-53-8-1518

We report terahertz (THz) wave generation by satisfying Cherenkov phase-matching condition in both s and ppolarizations. A dual-wavelength optical parametric oscillator is constructed from two potassium titanium oxide phosphate crystals pumped by a frequency-doubled Nd:YAG laser. By rotating the orientation of both a lithium niobate crystal (LiNbO3) and the polarization of the pump waves, the polarization of the THz wave changes. Due to the difference in the refractive index and absorption, the output power for p polarization is one tenth that for s polarization. A tuning range from 0.2 to 6.5 THz is obtained for s polarization, and from 0.2 to 4.2 and 5.4 to 6.9 THz for p polarization. The extraction efficiency is improved by changing the angle of prism for p polarization, and a large phase change occurs at total internal reflection. Consequently, p-polarized THz waves are optimal for spectroscopic applications.

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