椭偏激光场中分子双电离的理论研究

Double ionization of atoms and molecules driven by intense laser is a fundermental and important process in the region of strong field physics, which has been greatly concerned for the last few decades. Earlier investigations were mainly foused on the double ionization driven by linearly polarized laser pulses. With the development of laser technology and further research of double ionization, investigations of atomic double ionization by elliptical laser pulses also receive increasing attention in recent years. The results show that double ionization driven by the elliptical laser pulses reveals some new phenomena, shows ionization information which are unreachable with linear polarization, and provides new insigns and control mechanism for the investigation of double ionization. This project intends to study molecular double ionization by elliptically polarized laser pulses. Firstly, we improve the Heisenberg potential classical model used for atomic double ionization and it to the study of molecular double ioniztion. Then, by this model, we investigate the dependence of double ionization of molecules driven by elliptically polarized laser pulses on molecular structure, molecular alignment, ellipticity, intencitey, wavelength and carrier phase and analyze the physical nature of these dependence. This project will promote the comprehensive understanding of the process of electron dynamics and the effect of electron correlation in double ionization of atoms and molecules in intense laser fields.

强激光驱动的原子分子双电离是强场物理领域一基本并且重要的现象，近几十年来受到极大的关注。早期的研究主要集中于线偏激光驱动的原子分子双电离。近年来，随着激光技术的发展和双电离研究的深入，椭圆偏振激光驱动的原子双电离的研究逐渐吸引人们的关注。研究发现，椭圆偏振激光驱动的强场双电离出现诸多新的现象，并且能够提供线偏激光场无法提供的新信息，可为双电离的研究提供新的视角和控制机制。本项目拟开展椭圆偏振激光驱动的分子双电离特性的理论研究。首先对现有的研究原子双电离的海森堡势经典模型进行改进，将其拓展到分子双电离的研究；然后利用此模型，研究椭圆偏振激光驱动下双原子分子双电离对分子结构、分子取向、椭偏激光椭偏率、激光强度、波长、载波相位等的依赖特性，并分析此依赖特性的物理本质。该项目的研究有助于人们更加全面地认识强场激光驱动的原子分子电离动力学过程及电子关联作用。

椭圆偏振激光驱动的强场双电离是近年来强场物理的研究热点.椭圆偏振激光能够提供线偏激光场无法提供的电离信息，可为双电离的研究提供新的视角和控制机制。. 本项目系统地研究了椭偏场驱动的分子双电离特性。研究发现，分子双电离机制对椭偏场椭偏率、分子取向、分子结构和载波相位都有依赖关系，利用向后分析方法分析了这些依赖性的原因。在本项目资助下发表或接收的学术论文3篇。