Cunningham Paul D, Hayden L Michael
Department of Physics, University of Maryland Baltimore County, Baltimore, Maryland 21250, USA.
Opt Express. 2010 Nov 8;18(23):23620-5. doi: 10.1364/OE.18.023620.
We report the far-infrared properties of the organic crystal DAST, a popular terahertz emitter, from 0.6-12 THz through use of a THz spectrometer incorporating air-plasma THz generation and electro-optic (EO) sampling in a poled EO polymer. We identify absorption features at 1.1, 3.1, 5.2, 7.1, 8.4, 11, and 12.3 THz and at 1.1, 1.3, 1.6, 2.2, 3, 5.2, 7.2, 9.6 and 11.7 THz for a-axis and b-axis polarized THz radiation respectively. These results allow for more accurate prediction of the optimum crystal thickness for broadband THz emission via optical rectification and difference frequency generation.
我们通过使用一台太赫兹光谱仪，该光谱仪在极化电光聚合物中结合了空气等离子体太赫兹产生和电光（EO）采样技术，报告了有机晶体DAST（一种常用的太赫兹发射器）在0.6 - 12太赫兹范围内的远红外特性。我们分别确定了a轴和b轴偏振太赫兹辐射在1.1、3.1、5.2、7.1、8.4、11和12.3太赫兹以及在1.1、1.3、1.6、2.2、3、5.2、7.2、9.6和11.7太赫兹处的吸收特征。这些结果有助于更准确地预测通过光整流和差频产生实现宽带太赫兹发射的最佳晶体厚度。
