Kapitza-Dirac效应的GAC理论及其应用

从发现光电效应以来,人们对光与物质的相互作用的研究越来越多,越来越深入。尤其在激光发明以后,光场的强度越来越大,光束的准直性越来越好,人们可以利用它做大量的实验,从而发现了很多新的实验现象,例如阈上电离1],Kapitza＿Dirac效应2],高阶谐波效应3]等。这些现象用原有的光电理论已无法解释,从而发展了一些多光子电离的理论,其中以美国SouthernUniversity的郭东升教授及其合作者所发展的非微扰理论较为引人关注。这篇文章将详细介绍郭教授的工作以及相关的实验结果与理论研究的比较,希望人们对多光子领域的研究有更深一步的了解。文章首先介绍光与物质相互作用的理论基础,即Volkov解的得出及其讨论;文章第二部分将对多光子过程进行描述,并用第一部分结果进行一些定性的讨论;第三部分介绍Kapiza＿Dirac效应的实验结果与理论研究的比较;第四部分对整个理论体系予以综合评论,以及对强激光和物质作用的理论和实际应用的前景展望。

GAC THEORY ON KAPITZA-DIRAC EFFECT

Since the photoelectric effect was found,people have made more and more profound research work about the interaction of matters and light.The development of laser technique has made it possible to do many new experiments,and many new phenomena,such as above-threshold ionization(ATI),Kapitza-Dirac effect,high order harmonic generation etc.,have been exhibited.The old photoelectric theory cannot explain these new results any more,so some theories about multi-photon ionization have been developed.The non-perturbative quantum electrodynamics theory developed by Professor Dong-sheng Guo and his cooperators is more attractive.This paper will introduce Professor Guo's theoretical work and corresponding experiments in detail.We hope that people who are interested in this field can achieve more useful information through this paper.