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

该项目首先在系的四个实验室之一建造了实验装置。这种最初的设计使用40fs脉冲，使用孔芯光纤缩短，并使用交错反射镜重新压缩，以产生单色等离子体。这本身就是该项目的一个关键方面，因为短脉搏是至关重要的。虽然不幸的是，在这一点上没有观察到来自等离子体的太赫兹信号，但这并不出人意料。实验装置被转移到不同的实验室，为其他实验装置腾出空间。为实验设计了一个全新、紧凑和独特的设计，使我们不必分离双色等离子体所需的两种颜色。该单位购买了设计所需的光学元件，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。不幸的是，由于时间有限，他只能在大学里呆了3个月。尽管时间很短，他还是设法在那段时间内实现了从光导发射器获取太赫兹信号，使我们能够确定时间零点，并确保实验设置正确对准，这是该项目的关键垫脚石。

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.