Widely tunable terahertz-wave generation in an organic crystal and its spectroscopic application
Widely tunable terahertz-wave generation in an organic crystal and its spectroscopic application
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DOI：
10.1063/1.1713045
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发表时间：
2004-06-01
影响因子：
3.2
通讯作者：
Nakanishi, H
中科院分区：
文献类型：
--
作者：
Taniuchi, T;Okada, S;Nakanishi, H
对有机4-N，N-二甲氨基-4'-N'-甲基-芪对甲苯磺酸盐（DAST）晶体差频产生太赫兹（THz）波进行了理论和实验研究。我们研制了一种双波长光参量振荡器（OPO），采用两个KTiOPO4晶体作为输入光源。该振荡器的可调谐范围为1300 - 1450 nm，由二极管泵浦的倍频Q开关Nd：YAG激光器泵浦，脉冲宽度为10 ns。使用OPO从厚度为0.5和1 mm的DAST晶体中产生了范围从2到20 THz的宽调谐THz波。采用1 mm厚的DAST晶体，在11.6 THz和19 THz分别获得了82 nJ（峰值功率10.3 W）和110 nJ（峰值功率13.8 W）的THz输出。使用由太赫兹源和热释电探测器组成的可调谐太赫兹波系统，获得了聚四氟乙烯片的太赫兹光谱数据，并与从传统的远红外光谱仪获得的数据相媲美。(C)2004年，美国物理学会。
Terahertz (THz)-wave generation using difference-frequency mixing in an organic 4-N, N-dimethylamino-4'-N'-methyl-stilbazolium tosylate (DAST) crystal was investigated theoretically and experimentally. We developed a dual-wavelength optical parametric oscillator (OPO) with two KTiOPO4 crystals as the input light source. This oscillator has a tunable range from 1300-1450 nm and is pumped by a diode-pumped, frequency-doubled, Q-switched Nd:YAG laser with a pulse duration of 10 ns. Widely tunable THz waves ranging from 2 to 20 THz were generated from DAST crystals with 0.5- and 1-mm thickness using the OPO. THz output energies of 82 nJ (peak power of 10.3 W) at 11.6 THz and 110 nJ (peak power of 13.8 W) at 19 THz were obtained with a 1-mm-thick DAST crystal. Using a tunable THz-wave system consisting of the THz source and a pyroelectric detector, THz spectroscopic data for a polytetrafluoroethylene sheet were obtained and were comparable to data obtained from a conventional far-infrared spectrometer. (C) 2004 American Institute of Physics.