报告题目：Atoms in intense laser fields: light at the end of the tunnel

报告人： Wilhelm Becker 教授  （德国 Max-Born-Institut）

报告时间：2017年5月13日(星期六) 上午10点

报告地点：理论物理研究所报告厅

 

Abstract: A rare-gas atom in an intense laser field is one of the simplest realizations of a highly nonlinear driven system. This has by now been investigated experimentally and theoretically for almost fifty years, but new effects continue to emerge. Strong-field laser-atom physics has brought about high-order harmonic generation (HHG) and, as a byproduct, attosecond science. However, HHG is quite complicated since it involves collective (many atoms) and propagation effects. Above-threshold ionization (ATI) on the other hand, i.e. ionization with absorption of many more laser photons than necessary, can be studied as a one-atom effect. I will be concerned with ATI and discuss recent novel effects and their theoretical description. The work horse of the latter is (besides numerical solution of the time-dependent Schr?dinger equation) the "strong-field approximation" (SFA), which includes the binding (Coulombic) potential only to the minimum extent necessary to bind the electron and allow for rescattering. Recent experiments have focused on ATI electron spectra at very low energy where the effect of the Coulomb potential is expected to be dominant. I will discuss how this fits into the context of the SFA.

 

Wilhelm Becker 教授 1969年毕业于德国慕尼黑工业大学，获得理学博士学位， 1997年至今为德国马克思-波恩研究所资深研究员、终身教授，同时是美国物理学会以及美国光学学会Fellow，Phys. Rev. A 编委（1999-2004），Laser Phys. Lett. 编委（2003至今），APS杰出审稿人（2008）。W. Becker教授长期从事超快强激光与原子分子相互作用的理论研究，在Science、Rev. Mod. Phys.、Phys. Rev. Lett.等SCI期刊发表论文200余篇，H指数42。