Development of real time terahertz imaging system using optical mixing effect

利用光学混合效应开发实时太赫兹成像系统

• 批准号: 14205011
• 负责人: TANIUCHI Tetsuo
• 金额: $ 35.44万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14205011/
• 关键词: terahertz; nonlinear optics; organic material; 有機非線形光学材料; 非線形光学効果; 光パラメトリック発振器

Frequency conversion between optical and terahertz (THz) waves using nonlinear optical mixing in an organic DAST and GaP crystal was investigated theoretically and experimentally. Widely tunable THz waves ranging from 2 to 30 THz were generated from DAST crystals using a dual-wavelength optical parametric oscillator (OPO) with two KTiOPO_4 crystals as the input light source. The OPO has a tunable range from 1340 to 1550 nm and is pumped by a frequency-doubled, Q-switched Nd : YAG laser with a pulse duration of 12 ns. The THz output energy exceeding 550 nJ (peak power : 46 W) at 11.3 THz was obtained with a 1-mm-thick DAST crystal. Sub-THz waves in the range of 0.3-3 THz were also generated using an improved dual-wavelength OPO near 990 nm in combination with 2-mm-thick DAST and 15-mm-thick GaP crystals.Frequency conversion from THz-wave to optical wave can be achieved by sum frequency generation (SFG). Phase-matching conditions were studied for DAST, GaP, ZnTe and GaAs crystals. Sum frequency optical wave at 1400nm was generated from DAST crystal by mixing the THz wave at 11.3 THz and the optical wave at 1478 nm. These THz system consisting of the tunable THz source and the SFG detection system could potentially be used for real-time THz-imaging, THz-ranging, and spectroscopic applications.

对有机DAST和GaP晶体中利用非线性光学混频实现光波与太赫兹波的频率转换进行了理论和实验研究。采用双波长光学参量振荡器（OPO），以KTiOPO_4晶体为输入光源，从DAST晶体中产生了2 ~ 30 THz的宽调谐太赫兹波。OPO的可调谐范围为1340 ~ 1550 nm，泵浦光源为倍频调Q Nd：YAG激光器，脉冲宽度为12 ns。用1 mm厚的DAST晶体在11.3 THz获得了超过550 nJ（峰值功率：46 W）的THz输出能量。利用改进的990 nm双波长OPO，结合2 mm厚DAST和15 mm厚GaP晶体，产生了0.3 ~ 3 THz的亚太赫兹波，并通过和频产生（SFG）实现了太赫兹波到光波的频率转换。研究了DAST、GaP、ZnTe和GaAs晶体的相位匹配条件。利用DAST晶体将11.3THz的THz波与1478 nm的光波混频，产生了1400 nm的和频光波。该系统由可调谐太赫兹光源和SFG探测系统组成，可用于太赫兹实时成像、太赫兹测距和光谱应用。

项目成果

T.Taniuchi: "Continuously tunable terahertz-wave generation in GaP crystal by collinear difference frequency mixing"Electronics Letters. 40・5. 327-328 (2004)

T.Taniuchi：“通过共线差频混合在 GaP 晶体中产生连续可调太赫兹波”《电子快报》40・5（2004 年）。

Tunable Sub-Terahertz Wave Generation from an Organic DAST Crystal

由有机 DAST 晶体产生可调谐亚太赫兹波

• 发表时间: 2005
• 期刊: Jpn. J. Appl. Phys. 44
• 作者: 松下裕秀;野呂篤史;谷内 哲夫;Y. Mineno;T. Matsukawa;谷内 哲夫;T. Taniuchi;T. Matsukawa;T. Taniuchi;T. Matsukawa;Takeshi Matsukawa;Y. Takahashi;谷内 哲夫;岡田 修司;T. Taniuchi;S. Okada;T. Taniuchi;Yoshinori Takahashi;Shuji Okada;谷内 哲夫;岡田 修司;Yoshinori Takahashi;T. Taniuchi;Y. Mineno;T. Taniuchi;T. Taniuchi
• 通讯作者: T. Taniuchi

Collinear phase-matched terahertz-wave generation in GaP crystal using a dual-wavelength optical parametric oscillator

• DOI: 10.1063/1.1751238
• 发表时间: 2004-06
• 期刊: Journal of Applied Physics
• 影响因子: 3.2
• 作者: T. Taniuchi;H. Nakanishi

谷内 哲夫: "有機DAST結晶を用いた超広帯域周波数可変テラヘルツ波発生"第50回応用物理学関係連合講演会,29a-YQ-5. 3. (2003)

Tetsuo Taniuchi：“使用有机 DAST 晶体产生超宽带频率可调太赫兹波”第 50 届应用物理联合会议，29a-YQ-5。（2003 年）

Widely tunable terahertz-wave generation in an organic crystal and its spectroscopic application

• DOI: 10.1063/1.1713045
• 发表时间: 2004-06-01
• 期刊: JOURNAL OF APPLIED PHYSICS
• 影响因子: 3.2
• 作者: Taniuchi, T;Okada, S;Nakanishi, H
• 通讯作者: Nakanishi, H