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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。
Since the discovery of the photoelectric effect, the research on the interaction between light and matter has been more and more and more and more in-depth. Especially after the invention of the laser, the intensity of the light field is getting bigger and bigger, and the collimation of the light beam is getting better and better. People can use it to do a lot of experiments and discover a lot of new experimental phenomena, such as the threshold ionization [1] , Kapitza_Dirac effect [2], high order harmonic effect [3] and so on. These phenomena have not been explained by the original theory of optoelectronics, and some theories of multiphoton ionization have been developed. Among them, the non-perturbation theory developed by Professor Guo Dongsheng and his collaborators at SouthernUniversity of the United States has drawn more attention. This article will give a detailed introduction of Professor Guo’s work and the related experimental results and theoretical research. We hope people will have a deeper understanding of multiphoton research. The paper first introduces the theoretical basis of the interaction of light and matter, that is, the conclusion and discussion of Volkov’s solution. The second part of the article will describe the multiphoton process and some qualitative discussions with the results of the first part. The third part introduces the Kapiza_Dirac effect The fourth part gives a comprehensive review of the theoretical system as well as the theoretical and practical application prospects of strong lasers and materials.