Ultrabright Sources of Attosecond Pulses

原子和分子电子系统的内部机制在阿秒(10-18s)的时间尺度上运行，这需要在相同的时间尺度上产生强烈的光脉冲，以控制和探测这种超快动力学。一种有希望的途径是激光脉冲与固体密度等离子体表面的强相互作用，这导致相对论电子运动和入射场的非线性调制，对应于仅限于阿秒尺度爆发的超高频的存在。这种爆发在研究束缚电子动力学方面具有重要意义，对原子物理甚至原子化学的控制和研究都很重要。原子和分子中超快电荷运动的微观细节。高强度激光技术的不断进步使这些来源的广泛实现更接近现实，但仍然存在重大问题。决定这一过程的频率定标、脉冲持续时间和效率的详细微观动力学是什么？具有足够亮度的单个脉冲是否可以使用现有的激光设备进行全阿秒尺度的泵浦-探测研究？下一代激光技术可能提供哪些参数？我们如何才能将这种相互作用的数值模拟与观测到的不总是一致的实验标度联系起来？这将包括在英国和欧洲的各种高功率激光设施进行的实验工作，以及使用数值模拟代码来模拟这种相互作用。这名学生正在与等离子体物理中心(CPP)经验丰富的研究人员一起工作，并将特别参与在那里和全球各种主要设施(例如，欧洲和欧洲)的Taranis激光系统实验的规划和实施。英国的中央激光设施和德国耶拿亥姆霍兹研究所的JETI200激光器)。

The internal mechanics of atomic and molecular electronic systems operate on a timescale of attoseconds (10-18s) which require sources of intense bursts of light on this same timescale both for the control and probing of such ultrafast dynamics. One promising route to such a source is the intense interaction of a laser pulse with a solid density plasma surface which leads to relativistic electron motion and nonlinear modulation of the incident field corresponding to the presence of ultrahigh frequencies confined to attosecond scale bursts. Such bursts have applications in the study of bound electron dynamics important for atomic physics and even control and study of atto-chemistry - the microscope details of ultrafast charge motion in atoms and molecules.Continuous advances in high intensity laser technology are bringing the widespread realisation of these sources closer to reality but significant questions still exist. What are the detailed microscopic dynamics that dictate the frequency scaling, pulse duration and efficiency of this process? Can individual pulses with sufficient brightness to perform full attosecond scale pump-probe studies using existing laser facilities and what parameters are possible with the next generation of laser technology? How can we bridge numerical simulations of this interaction to observed experimental scalings which don't always agree?This will comprise of both experimental work at various high power laser facilities in the UK and Europe and the use of numerical simulation codes to model the interaction. The student is working alongside experienced researchers in the Centre for Plasma Physics (CPP) and will be particularly involved in the planning and implementation of experiments on the TARANIS laser system based there and at a variety of major facilities globally (eg. the Central Laser Facility in the UK and the JETI200 laser at the Helmholtz Institute Jena in Germany).