报告题目：Novel applications of tabletop-scale extreme-UV and X-ray sources implemented using high-order harmonic generation

　　报告时间：2018年8月8日 13:00–14:0 

　　报告地点：108会议室

　　报告人：Prof. Henry C. Kapteyn 

  　报告摘要：  

　250 Word Abstract 

　　 As the technology for generating coherent EUV and soft x-ray light advances, tabletop “x-ray laser” sources are being applied to an increasing variety of problems in science and technology. In this talk, I will discuss recent work in our group in a number of areas in materials and molecular science that demonstrate new capabilities. For example, ultrafast EUV pulses can be used as a probe of spin and carrier dynamics using both photoemission and the EUV Magneto-Optic Kerr Effect. Comparing the results from these two approaches yields new insights into dynamic interactions in materials. In other work, we demonstrated the highest resolution tabletop-scale imaging to-date, using coherent EUV for high numerical aperture Coherent Diffractive Imaging. The temporal and spatial resolution provided by using short pulses and short-wavelengths has also allowed us to make the first ultra-high resolution movies of acoustic wave propagation in nanostructures, using a tabletop-scale apparatus. In sum, the emergence of tabletop coherent sources of EUV and soft x-ray light provides a new tool for understanding of materials and for advancing nanotechnology.  

　100-Word Version 

　　As the technology for generating coherent extreme-UV and soft x-ray light advances, tabletop “x-ray laser” sources are being applied to an increasing variety of problems in science and technology. In this talk, I will discuss recent work in our group in a number of areas in materials and molecular science that demonstrate new capabilities. These area include studies of materials dynamics using multiple experimental approaches, ultrahigh-resolution coherent diffractive imaging that for the first time in the extreme-UV exceeds the wavelength in spatial resolution, and the first movies of nanoscale dynamics done using these sources.  

　  Henry C. Kapteyn is CEO of Kapteyn-Murnane Laboratories Inc. (KMLabs), a Professor of Physics and ECE at the University of Colorado at Boulder, and a fellow of JILA—a research institute joint between the University of Colorado and NIST. He and his wife and long-term collaborator, Margaret Murnane, are well known for their research in femtosecond lasers, and for understanding how to coherently upconvert this light to make a “tabletop x-ray laser” that generates ultrashort bursts of short-wavelength light. In recent years, they have applied this source to pioneering studies of atomic, molecular, and material studies at short length- and time-scales. He has published more than 200 papers in topics ranging from laser science and engineering to materials to nanoimaging. He was elected to the US National Academy of Sciences in 2013, the American Academy of Arts and Sciences in 2018, and is a fellow of the American Physical Society, the Optical Society of America, and the American Association for the Advancement of Science. His awards include the Adolph Lomb Medal of the OSA in 1993, the Ahmed Zewail Award of the ACS in 2009, the R.W. Wood Prize of the OSA in 2010, the Arthur Schawlow Prize of the APS in 2010, and the Willis Lamb Award in Quantum Electronics in 2012. Since 2015, his time has been primarily at KMLabs, spearheading the efforts to commercialize coherent EUV laser technologies and novel ultrafast lasers.