Widely tunable terahertz wave generation using organic salt DAST

使用有机盐 DAST 产生广泛可调的太赫兹波

• 批准号: 12650354
• 负责人: KAWASE Kodo
• 金额: $ 2.37万
• 依托单位: RIKEN
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650354/
• 关键词: Terahertz-gave; Nonlinear Optics; Organic nonlinear crystal; Difference frequency generation; Widely tunable; 非線形光学; テラヘルツ; 擬似位相整合; パラメトリック; THz波; 差周波混合; 広帯域波長可変; DAST結晶

A dual signal-wave quasi-phase-matched optical parametric oscillator was successfully demonstrated by use of periodically poled LiNbO_3 with cascade gratings. A compact THz-wave or far-infrared source was realized by difference frequency generation in DAST crystal using the DSW-QPM-OPO as a source. Since it is possible to vary the two signal wavelengths widely, a broad tuning range in the THz region is easily obtained. A PPLN with two periods on a pump-path has two energy conservation and phase matching conditions, so that one pump-wave can generate two signal-waves. We applied this light source to THz-wave difference frequency generation usilng a highly efficient organic ionic salt crystal of 4-dimethylamino-N-methyl-4-stilbazolium-tosylate (DAST) which we grew. The incident beams were focused by a lens (f=100mm) on a spot about 0.5mmφ in size. The THz-wave generated was monitored with a 4K Si-bolometer. The typical THz-wave output was 10fJ/pulse. The THz wavelength was measured using a scanning Fabry-Perot etalon consisting of two metal mesh plates. The polarization direction of the THz-wave was shown to be parallel to the a-axis of the crystal by using a wire grid polarizer.

利用带级联光栅的周期极化LiNbO_3成功地实现了双信号波准相位匹配光学参量振荡器。采用ww - qpm - opo作为源，在DAST晶体中产生差频，实现了紧凑的太赫兹或远红外源。由于两个信号波长的变化范围很大，因此很容易在太赫兹区域获得较宽的调谐范围。在一个泵路上具有两个周期的PPLN具有两个能量守恒和相位匹配条件，因此一个泵波可以产生两个信号波。我们将该光源应用于太赫兹波差频产生，使用了我们生长的4-二甲氨基- n -甲基-4-甲酰戊二酸酯（DAST）的高效有机离子盐晶体。入射光束通过透镜（f=100mm）聚焦在直径约0.5mmφ的点上。产生的太赫兹波用4K硅热计监测。典型的太赫兹波输出为10fJ/脉冲。太赫兹波长测量使用扫描法布里-珀罗标准子组成的两个金属网板。利用线栅偏振器，证明了太赫兹波的偏振方向平行于晶体的a轴。

项目成果

川瀬晃道,伊藤弘昌: "光波からテラヘルツ波への波長変換"エレクトロニクス. Vol.45,No.9. 60-63 (2000)

Akimichi Kawase，Hiromasa Ito：“从光波到太赫兹波的波长转换”，电子学，第 45 卷，第 60-63 期。

H. Ito, T. Hatanaka, S. Haidar, K. Nakamura, K.Kawase, and T. Taniuchi: "Periodically poled LiNbO_3 OPO for generating Mid IR to terahertz waves"Ferroelectrics. vol.253. 95-104 (2001)

H. Ito、T. Hatanaka、S. Haidar、K. Nakamura、K.Kawase 和 T. Taniuchi：“周期性极化的 LiNbO_3 OPO，用于产生中红外至太赫兹波”铁电体。

H.Ito, T.Hatanaka, S.Haidar, K.Nakamura, K.Kawase, T.Taniuchi: "Periodically poled LiNbO_3 OPO for generating Mid IR to terahertz waves"Ferrolectrics. vol.253. 95-104 (2001)

H.Ito、T.Hatanaka、S.Haidar、K.Nakamura、K.Kawase、T.Taniuchi：“周期性极化的 LiNbO_3 OPO，用于产生中红外至太赫兹波”铁电体。

T.Hatanaka, K.Kawase, H.Takahashi, K.Nakamura, T.Taniuchi, H.Ito: "Dual signal-wave parametric oscillation using PPLN for generating THz-waves from DAST crystal"Technical Digest of Conference on Lasers and Electro-Optics (CLEO2000). CTuA7. 141-142 (2000)

T.Hatanaka、K.Kawase、H.Takahashi、K.Nakamura、T.Taniuchi、H.Ito：“使用 PPLN 从 DAST 晶体生成太赫兹波的双信号波参量振荡”激光与电学会议技术文摘

Yu.H.Avetisyan,K.Kawase,and H.Ito: "Surface-emitted difference frequency generation in non-ferroelectric materials"Terahertz and Gigahertz Electronics and Photonics II,Proc.SPIE. Vol.4111. 382-390 (2000)

Yu.H.Avetisyan、K.Kawase 和 H.Ito：“非铁电材料中的表面发射差频产生”太赫兹和千兆赫电子与光子学 II，Proc.SPIE。