Generation of broadband high-field terahertz radiation using two-colour microplasma

使用双色微等离子体产生宽带高场太赫兹辐射

• 批准号: 21K14217
• 负责人: BACON David
• 金额: $ 2.66万
• 依托单位: Okinawa Institute of Science and Technology Graduate University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Early-Career Scientists
• 财政年份: 2021
• 资助国家: 日本
• 起止时间: 2021-04-01 至 2024-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-21K14217/
• 关键词: Terahertz; Optics; Microplasma; microplasma

This project began by constructing the experimental setup in one of the four labs of the department. This original design used 40fs pulses, shortened using a hole core fiber and recompressed using staggered mirrors, to generate a 1 colour plasma. This itself was a key aspect of the project as a short pulse is vital. While unfortunately no THz signal was observed from the plasma at this point, this was not unexpected. The experimental setup was transferred to a different lab to make space for other experimental setups.A completely new, compact and unique design for the experiment was devised, which prevented us from having to separate the two colors required for the 2 colour plasma. The optics required for this design were purchased and an intern with limited time-domain spectroscopy experience was employed by the unit to help with the setup up. Unfortunately due to time constraint he could only stay at the university for 3 months. Despite this short time, he did manage to achieve the acquisition of a THz signal from a photoconductive emitter in that time, allowing us to determine time zero and ensure that the experimental setup in aligned correctly, a crucial stepping stone in the project.

该项目首先在该部门的四个实验室之一建立实验装置。这种原始设计使用40 fs脉冲，使用孔芯光纤缩短并使用交错镜重新压缩，以产生1色等离子体。这本身就是该项目的一个关键方面，因为短脉冲至关重要。虽然不幸的是，在这一点上没有从等离子体中观察到THz信号，但这并不意外。实验装置被转移到另一个实验室，为其他实验装置腾出空间。设计了一个全新的，紧凑的和独特的实验设计，这使得我们不必分离双色等离子体所需的两种颜色。购买了该设计所需的光学器件，并雇用了一名具有有限时域光谱经验的实习生来帮助设置。由于时间的限制，他只能在大学里呆三个月。尽管时间很短，但他确实设法在那段时间内从光电导发射器中获取了THz信号，使我们能够确定时间零点并确保实验装置正确对齐，这是该项目的关键垫脚石。

项目成果

High Field Single- to Few-Cycle THz Generation with Lithium Niobate

• DOI: 10.3390/photonics8060183
• 发表时间: 2021-05
• 期刊: Photonics
• 影响因子: 2.4
• 作者: Xing Zhu;D. R. Bacon;J. Madéo;K. Dani

Photoconductive emitters for pulsed terahertz generation

• DOI: 10.1088/2040-8986/abf6ba
• 发表时间: 2021-06-01
• 期刊: JOURNAL OF OPTICS
• 影响因子: 2.1
• 作者: Bacon, David R.;Madeo, Julien;Dani, Keshav M.
• 通讯作者: Dani, Keshav M.