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

本计画首先在系内四个实验室中的一个建立实验装置。这个最初的设计使用40fs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。这本身就是项目的一个关键方面，因为短脉冲是至关重要的。虽然不幸的是，在这一点上没有从等离子体中观察到太赫兹信号，但这并不意外。实验装置被转移到另一个实验室，以便为其他实验装置腾出空间。为实验设计了一个全新的，紧凑的和独特的设计，这使我们不必分离2色等离子体所需的两种颜色。该单位购买了该设计所需的光学器件，并聘请了一位具有有限时域光谱学经验的实习生来帮助进行设置。不幸的是，由于时间限制，他只能在学校呆3个月。尽管时间很短，但他确实在这段时间内成功地从光导发射器获取了太赫兹信号，使我们能够确定时间零点，并确保实验装置正确对准，这是项目中至关重要的垫脚石。

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.