题目：Toward Waveform Nonlinear Optics Using High-Energy Sub-Optical-Cycle Waveform Synthesizers
报告人：Professor Oliver D. Mücke
（Center for Free-Electron Laser Science (CFEL), Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany）
摘要：
Waveform Nonlinear Optics aims to study and control the nonlinear interaction of matter with extremely short optical waveforms E(t) custom-tailored within an optical cycle of light. Several new applications arise in attoscience and strong-field physics, e.g., the generation of intense isolated attosecond XUV pulses, relativistic laser-plasma interactions and laser-driven electron acceleration, launching valence-electron wavepacket dynamics in atoms and molecules, and control of sub-cycle electron transport in solids.
The Ultrafast Optics and X-Rays Division at DESY CFEL is currently pursuing two different technological approaches to generate intense sub-cycle waveforms. In this lecture, I will discuss the experimental schemes, the technological challenges and our experimental results on high-energy sub-cycle optical waveform synthesis based on (i) parametric amplification and (ii) induced-phase modulation in a gas-filled hollow-core fiber compressor.
First, a CEP-stable 3-channel multi-mJ sub-cycle parametric waveform synthesizer driven by a non-CEP-stable cryogenically cooled Ti:sapphire amplifier is discussed (see left photo above). In this system, a passively CEP-stable white-light seed continuum (0.5-2.5 µm) is split and amplified in three parallel parametric amplification channels (VIS NOPA, NIR DOPA, IR DOPA) up to the multi-mJ level. The amplified spectra support 1.9-fs FWHM waveforms. Preliminary FROG pulse-characterization results demonstrate the feasibility to recompress all three channels simultaneously close to the Fourier limit. Finally, the relative timing of the pulses can be locked with sub-cycle precision using balanced optical cross-correlators.
Second, waveform synthesis relying on self-phase modulation (SPM) in hollow-core fiber (HCF) compressors represents a rather mature technology and has recently permitted the generation of sub-cycle pulses (covering 260-1100 nm). However, the energy throughput is typically limited to several tens or hundreds of µJ (depending on bandwidth) due to gas ionization. A potential solution out of this energy-scaling dilemma is the application of induced-phase modulation (IPM) based on the interaction between two (or more) copropagating optical pulses of different colors. I will discuss the advantages of our IPM synthesizer over SPM with respect to control over the spectral shape and bandwidth, as well as relieving the energy-scaling bottleneck in the UV region.
We foresee that our waveform synthesizers will become versatile tools for controlling strong-field interactions in matter, for attosecond pump-probe spectroscopy employing ultrashort pulses in the VIS/IR and XUV/soft-X-ray regions, and for the realization of bright coherent tabletop high-harmonic sources in the water-window region.
简介：
Oliver D. Mücke received his Diploma and Ph.D. degrees in physics from the Universität Karlsruhe (now KIT), Germany in 1999 and 2003, respectively. He worked was a postdoc at the MIT Research Laboratory of Electronics in Cambridge, MA, USA (09/2003-02/2007) and at the Photonics Institute at Vienna University of Technology, Austria (03/2007-07/2011). Since 07/2011 he is a Senior Scientist at DESY CFEL in Hamburg, Germany. His research interests include CEP-stable few-cycle pulse generation from octave-spanning Ti:sapphire oscillators and parametric amplifiers, high-energy multi-octave waveform synthesis, strong-field physics and attoscience, highly efficient intense THz-pulse generation, laser-driven sources of particles and hard-X-rays, frequency-comb technology for optical clocks, extreme nonlinear optics in solids and nanostructures. In 2013 he was member and since 2014 is chair of the CLEO/QELS Subcommittee on High-Field Physics and Attoscience.
时间：2014年4月15日（星期二）上午10：00
地点：中科院物理研究所M楼236会议室
联系人：尹 彦 研究员 （Tel：82648061）
金奎娟 研究员 （Tel：82648099）
主办单位：中国科学院光物理重点实验室，中国科学院物理研究所-美国光学学会学生俱乐部
