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9月30日学术报告

来源： 发布时间：2014-09-24【字体：大 中 小】

　　题目：Sub-Cycle Optical Waveform Synthesis and Controlled Electron Emission　

　　姓名：Franz X. Kartner　

　　单位：Center for Free-Electron Laser Science, DESY and Department of Physics,University of Hamburg　　

　　时间：2014年9月30日（星期二） 下午2:00 

　　地点：溢智厅  

    Abstract

　　Many strong-field processes greatly benefit from the availability of single-cycle to sub-cycle optical pulses ranging from the generation of intense isolated attosecond XUV pulses, to in vacuum laser-driven electron acceleration and strong field photo emission.

　　In this talk, we present a scalable approach to a multi-mJ, more than 2-octave wide optical waveform synthesizer covering the wavelength range from 0.5 - 2.5 ?m using parametric amplification. Key to energy-scalable synthesis are (i) broadband carrier-envelope phase (CEP) stable continuum generation, that can serve as a seed for the synthesizer; (ii) a powerful and energetic fs or ps-pump laser technology for powering the multi-channel OPAs or OPCPAs that amplify the seed radiation to the desired energy level; (iii) two-octave spanning dichroic dispersion compensating mirrors to split and recombine spectral ranges without introducing phase distortions that cannot be compensated for; (iv) broadband optical parametric amplification channels and (v) a device to stabilize the relative timing and phase of the individually amplified wavelength channels, i.e., to execute the waveform synthesis. Progress towards such a synthesizer will be presented and potential applications are discussed. First results on carrier-envelope phase controlled strong-field photo emission from metallic nanostructures will be shown using three cycle pulses from a continuum fiber laser source.

  　Short Biography of Franz X. Kartner

　　Franz X. Kartner received his Diploma and Ph.D. degree in Electrical Engineering from Technical University Munich in 1986 and 1989, respectively and a Habilitation degree in Experimental Physics at ETH-Zürich in1997. After faculty positions at University of Karlsruhe (TH) and MIT, he joined in 2011 the Center for Free-Electron Laser Science (CFEL) at DESY, and is Professor of Physics at University of Hamburg, and Adjunct Professor of Electrical Engineering at Massachusetts Institute of Technology (MIT). His research is focused on few-cycle and ultralow jitter femtosecond lasers for optical metrology, attosecond science and compact x-ray sources. He is a fellow of the IEEE and OSA.

 

                                                                所办公室

                                                               2014.9.24

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