固体材料中的高次谐波产生及超快控制与探测

In the atomic and molecular system, attosecond pulses are produced using a strong field laser, which can control the electronic movement in the time scale of attosecond, and opens up a new field of ultrafast optics in the time scale of attosecond. High-order harmonic produced in solid materials and ultrafast control research is a frontier just emerging and developing in recent years. And the research on the strong-field ultrafast new laws and effects in solid materials has also just begun. The current is still in rapid expansion and is expected to make significant new breakthroughs in key stage. This research project aims to explore the new effects of electron/hole movement and different band structure under strong laser field, through the physical process including high-order harmonic generation and band gap transient changes in solid materials driven with strong mid-infrared femtosecond laser field; to establish physical model to analyze the new mechanism in those physical process; to explore new theory and new technology of ultrafast control and measurement of strong correlation electronic dynamics and all sorts of quasiparticle, using the ultrafast control and detection technology established in atomic molecular system; to explore how to effectively control current, which has the potential to develop into high-speed optoelectronic devices.

在原子分子体系中，利用强场激光产生阿秒脉冲，可在阿秒时间尺度操控电子运动，开辟了阿秒时间尺度的超快光学新领域。固体材料中的高次谐波产生和超快控制研究是近年刚兴起并发展的前沿领域，固体材料的强场超快新效应新规律的研究还刚刚开始，当前仍然处在迅速拓展并可望取得重大新突破的关键阶段。本项目拟通过固体材料与中红外飞秒强激光场相互作用产生高次谐波、带隙瞬态变化等物理过程，研究电子/空穴运动及不同的能带结构在强激光场作用下的新效应，并建立物理模型分析这些物理过程的新机制；用原子分子体系中确立的阿秒超快控制与探测技术，探索研究在固体中对强关联电子动力学和各种准粒子实现超快控制与测量的新原理和新技术，探索如何有效地控制电流运动，使其具备发展成为高速光电器件的可能。

在原子分子体系中，利用强场激光产生阿秒脉冲，可在阿秒时间尺度操控电子运动，开辟了阿秒时间尺度的超快光学新领域。固体材料中的高次谐波产生和超快控制研究是近年刚兴起并发展的前沿领域，固体材料的强场超快新效应新规律的研究还刚刚开始，当前仍然处在迅速发展并可望取得重大新突破的关键阶段。本项目从理论和实验上研究了固体介质中的高次谐波产生、高次谐波相干辐射产生及其瞬态吸收特性，理论上提出了一种基于速度规范密度矩阵方程的新的理论模型，并结合实验阐明了某些固体材料中高次谐波产生的物理机制，同时通过高次谐波产生的特性可为材料的表征提供一种全光方法。