Dynamical Control of Resonant Light-Matter Interaction

该项目将开发新的动力学方法，通过在时间和/或空间上调制共振原子跃迁的参数（频率和/或线宽），通过强非共振控制场来控制共振光物质相互作用。它包括：(1)通过原子参数的时间调制的谱展宽来形成VUV和XUV阿秒脉冲的一种新的高效方法；(2)通过强激光场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。在强红外或光学激光辐射的动态扰动下，紫外和紫外辐射在光学厚的共振吸收原子介质中传播时的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。阿秒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、生物学、医学和能量学等领域有着广泛的应用。阿秒脉冲形成新方法的发展，其脉冲特性优于或互补于现有的高谐波产生技术，将进一步推动那些具有战略意义和根本意义的重要应用。在由控制场的强度和频率决定的具有广泛可变参数的均匀分布原子系综中光学产生光子结构的新方法的发展，将从根本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、分子和光学科学的交叉领域进行训练，学习和发展基于现代激光技术的超快强场中光-物质相互作用的相干控制方法。与实验组的合作将被启动，目的是在实验研究中实施新开发的动态连贯控制方法。

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.