Dynamical Control of Resonant Light-Matter Interaction

该项目将开发新的动力学方法，通过利用强大的非共振控制场在时间和/或空间上调制共振原子跃迁的参数(频率和/或线宽)来控制共振光-物质相互作用。它包括发展(I)通过原子参数的时间调制进行光谱展宽来产生VUV和XUV阿秒脉冲的新的高效方法，以及(Ii)通过对强激光诱导的折射率的特殊调制来产生和光学控制均匀原子介质中的光子结构的方法。在强红外或强激光辐射的动态扰动下，VUV和XUV辐射在光学厚度的共振吸收原子介质中传播时的辐射转换理论将得到发展。它将促进对强超快光-物质相互作用的理解和控制，包括对共振、干涉和合作效应在这种相互作用中的作用的认识。阿托塞克脉冲为记录和控制原子、分子和纳米结构中的电子运动提供了一种独特的超快工具，在化学和生物、医学和能量学中有着广泛的应用。具有优于或补充现有高次谐波产生技术的脉冲特性的阿秒脉冲形成新方法的发展将进一步推动这些具有战略意义和根本性的重要应用。在均匀分布的原子系综中光学产生由控制场的强度和频率决定的参数广泛可变的光子结构的新方法的发展，将从本质上扩展这种结构在控制和操纵光流方面的应用。研究生和本科生将在原子、分子和光学等交叉学科领域进行培训，学习和开发基于现代激光技术的超快强场区域中光-物质相互作用的相干控制方法。将启动与实验小组的合作，目的是在实验研究中实施新开发的相干控制的动力学方法。

The project will develop new dynamical methods to control the resonant light-matter interaction through modulation in time and/or in space of the parameters of the resonant atomic transition (frequencies and/or line widths) by means of the strong off-resonant control field. It includes the development of (i) a new highly efficient method for the formation of the VUV and XUV attosecond pulses via the spectrum broadening by means of the temporal modulation of the atomic parameters and (ii) a method to produce and to control optically the photonic structures in a homogeneous atomic media via special modulation of the refractive index induced by the strong laser field. A theory of the VUV and XUV radiation transformation during its propagation through an optically thick resonantly absorbing atomic medium, dynamically perturbed by a strong IR or optical laser radiation, will be developed. It will advance understanding and control of the strong ultrafast light-matter interactions, including appreciation of the role of the resonant, interference, and cooperative effects in such interactions. Attosec pulses provide a unique ultrafast tool for recording and control of the electronic motion in atoms, molecules, and nanostructures, leading to profound applications in chemistry and biology, medicine and energetics. Development of the new method of attosecond pulse formation with the pulse characteristics superior or complementary to those produced by the current high-harmonic-generation technique will further push those strategically and fundamentally important applications. Development of the new method for an optical production of the photonic structures in the homogeneously distributed atomic ensembles with the widely variable parameters, determined by the intensity and frequency of the control field, will essentially extend the applications of such structures for the control and manipulation of the flow of light. The graduate and undergraduate students will be trained in these interdisciplinary fields of atomic, molecular, and optical science, learning and developing the methods of coherent control of the light-matter interaction in the ultrafast strong-field regimes based on the modern laser technologies. Collaboration with experimental groups will be initiated, aiming at implementation of the newly developed dynamical methods of coherent control in the experimental investigations.