Ultrafast Spectroscopy using High-Power Terahertz Electromagnetic Pulses

使用高功率太赫兹电磁脉冲的超快光谱学

• 批准号: 11440088
• 负责人: HATTORI Toshiaki
• 金额: $ 9.66万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11440088/
• 关键词: terahertz; EO sampling; femtosecond; nonlinear optics; ultrafast spectroscopy; gallium arsenide; parabolic mirror; Gaussian beam; テラヘルツ電磁パルス; テルル化亜鉛

Firstly, using the equipment for the terahertz pulse generation and waveform measurement setup based on the EO sampling, both have been constructed by the end of last year, focusing and free-space propagation of terahertz pulses were studied. This is necessary to achieve high electric field with the waveform of the pulses under control. Secondly, new optical setup using off-axis parabolic mirrors with a shorter focal length was newly made, and focusing properties of terahertz pulses were studies. From these studies, the following has been clarified : i) The negative trailing part of the pulse, which has been observed by many groups including us, was found to be caused by the cutoff of the waveguide effects of metal structures constituting the EO crystal holder. ii) By knife-edge measurements at the focal plane, frequency-dependent focusing properties has been clarified, which has been shown to be in good agreement with the results of the Gaussian beam theory. iii) Maximum field of 11 kV/cm has been achieved, which is, to our knowledge, is the world record of the values directly measured by the EO method.

首先，利用去年年底建成的太赫兹脉冲产生装置和基于电光采样的波形测量装置，对太赫兹脉冲的聚焦和自由空间传输进行了研究。这是在控制脉冲波形的情况下实现高电场所必需的。其次，利用较短焦距的离轴抛物面反射镜制作了新的光学装置，研究了太赫兹脉冲的聚焦特性。通过这些研究，澄清了以下几点：i)包括我们在内的许多小组已经观察到的脉冲的负拖尾部分，被发现是由构成电光晶体支架的金属结构的波导效应的截止所引起的。Ii)通过在焦平面上的刀口测量，阐明了聚焦的频率特性，这与高斯光束理论的结果是一致的。3)达到了11千伏/厘米的最大磁场，据我们所知，这是用电光方法直接测量的值的世界纪录。

项目成果

T.Hattori: "Femtosecond pulse shaping with twisted-nematic liquid-crystal"Jpn. J. Appl. Phys. 38(10). 5898-5904 (1999)

T.Hattori：“利用扭曲向列液晶进行飞秒脉冲整形”Jpn。

N.Tsurumachi: "Time response of one-dimensional photonic crystals with a defect"Jpn. J. Appl. Phys. 38(12A). L1400-L1402 (1999)

N.Tsurumachi：“有缺陷的一维光子晶体的时间响应”Jpn。

T.Fuji et al.: "Femtasecond interferoineteric waveform measurement of photon achoes using a collinear geometry"Jpn.J.Appl.Phys.. 39. 3429-3437 (2000)

T.Fuji 等人：“使用共线几何结构对光子回波进行飞秒干涉波形测量”Jpn.J.Appl.Phys.. 39. 3429-3437 (2000)

T.Hattori et al.: "Autoconelction measurement of temtosecond optical pulses based on two-photon photoemission in a photomultiplier tube"Jpn.J.Appl.Phys.. 39. L809-L811 (2000)

T.Hattori 等人：“基于光电倍增管中双光子光电发射的太秒光脉冲的自动连接测量”Jpn.J.Appl.Phys.. 39. L809-L811 (2000)

T.Hattori et al.: "Femtasecond two-photon response dynamics of phstomultiplier tubes"Jpn.J.Appl.Phys.. 39. 4793-4798 (2000)

T.Hattori 等：“光倍增管的飞秒双光子响应动力学”Jpn.J.Appl.Phys.. 39. 4793-4798 (2000)