Miyamoto Katsuhiko, Ohno Seigo, Fujiwara Masazumi, Minamide Hiroaki, Hashimoto Hideki, Ito Hiromasa
Tera-photonics laboratory, RIKEN Sendai, 519-1399, Aramaki-aoba, Aoba-ku, Sendai, Miyagi 980-0845, Japan.
Opt Express. 2009 Aug 17;17(17):14832-8. doi: 10.1364/oe.17.014832.
An effective and widely tunable means of producing terahertz (THz) radiation using difference-frequency generation (DFG) in an organic N-benzyl-2-methyl-4-nitroaniline (BNA) crystal was demonstrated by optimizing the pump wavelengths. We calculated the (wideband) refractive index and coherence length mapping of BNA to establish the optimum phase-matching condition of the DFG configuration. To satisfy the phase-matching conditions over the range 0.1-20 THz, both pump wavelengths were varied from 780 to 950 nm, and the optical wavelength dependency of the THz-wave output was clearly observed. We expanded the range of THz-wave generation and increased the power output to ten times that obtained using previous methods.
通过优化泵浦波长，展示了一种在有机N-苄基-2-甲基-4-硝基苯胺（BNA）晶体中利用差频产生（DFG）来产生太赫兹（THz）辐射的有效且广泛可调的方法。我们计算了BNA的（宽带）折射率和相干长度映射，以建立DFG配置的最佳相位匹配条件。为了在0.1 - 20 THz范围内满足相位匹配条件，两个泵浦波长均在780至950 nm之间变化，并且清楚地观察到了太赫兹波输出的光学波长依赖性。我们扩展了太赫兹波的产生范围，并将功率输出提高到了先前方法所得功率的十倍。
