Ultrabright Sources of Attosecond Pulses

原子和分子电子系统的内部机制在阿秒（10- 18秒）的时间尺度上运行，这需要在同一时间尺度上的强烈爆发光源来控制和探测这种超快动力学。一个有前途的路线，这样的源是强烈的相互作用的激光脉冲与固体密度等离子体表面，导致相对论电子运动和非线性调制的入射场对应的存在下，限制到阿秒尺度的爆发的频率。这样的爆发在束缚电子动力学的研究中有重要的原子物理学的应用，甚至控制和原子化学的研究-原子和分子中超快电荷运动的显微镜细节。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。什么是详细的微观动力学，决定了频率缩放，脉冲持续时间和效率的这一过程？使用现有的激光设备，是否可以使用具有足够亮度的单个脉冲来进行全阿秒尺度的泵浦探测研究？下一代激光技术可能使用哪些参数？我们如何将这种相互作用的数值模拟与观察到的并不总是一致的实验尺度联系起来？这将包括在英国和欧洲的各种高功率激光设施的实验工作和使用数值模拟代码来模拟相互作用。该学生将与等离子体物理中心（CPP）经验丰富的研究人员一起工作，并将特别参与计划和实施基于那里和全球各种主要设施（例如，TARANIS激光系统）的实验。英国的中央激光设备和德国耶拿亥姆霍兹研究所的JETI 200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).