Abstract
It is theoretically shown that application of a phase mask in optical rectification scheme is equivalent to spatial modulation of the crystal’s nonlinear coefficient in cross-section plane of the laser beam. It allows using the technique of quasi-phase-matching for efficient noncollinear terahertz (THz) generation by using high-power wide-aperture optical beam. According to calculations, the linewidth of THz generation can be varied from 10 GHz to a few THz by changing the optical beam size. It is shown that the frequency of THz generation can be also tuned by building the image of the phase mask in the crystal with variable magnification.
© 2012 Optical Society of America
Full Article | PDF ArticleMore Like This
Caihong Zhang, Yuri Avetisyan, Gevorg Abgaryan, Iwao Kawayama, Hironaru Murakami, and Masayoshi Tonouchi
Opt. Lett. 38(6) 953-955 (2013)
Yuri Avestisyan, Caihong Zhang, Iwao Kawayama, Hironaru Murakami, Toshihiro Somekawa, Haik Chosrowjan, Masayuki Fujita, and Masayoshi Tonouchi
Opt. Express 20(23) 25752-25757 (2012)
Daniel Dietze, Karl Unterrainer, and Juraj Darmo
Opt. Lett. 37(6) 1047-1049 (2012)