Abstract
We report terahertz (THz) wave generation by satisfying Cherenkov phase-matching condition in both and polarizations. 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 () 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 polarization is one tenth that for polarization. A tuning range from 0.2 to 6.5 THz is obtained for polarization, and from 0.2 to 4.2 and 5.4 to 6.9 THz for polarization. The extraction efficiency is improved by changing the angle of prism for polarization, and a large phase change occurs at total internal reflection. Consequently, -polarized THz waves are optimal for spectroscopic applications.
© 2014 Optical Society of America
Full Article | PDF ArticleMore Like This
Koji Suizu, Takayuki Shibuya, Hirohisa Uchida, and Kodo Kawase
Opt. Express 18(4) 3338-3344 (2010)
Takuya Akiba, Yasuhiro Akimoto, Motoaki Tamura, Koji Suizu, Katsuhiko Miyamoto, Takashige Omatsu, Jun Takayanagi, Tomoya Takada, and Kodo Kawase
Appl. Opt. 52(34) 8305-8309 (2013)
Koji Suizu, Takayuki Shibuya, Takuya Akiba, Toshihiro Tutui, Chiko Otani, and Kodo Kawase
Opt. Express 16(10) 7493-7498 (2008)