Seminars of the Focus Area Complex Systems

Prof. Dr. C. Beta, Prof. Dr. K. Dethloff, Prof. Dr. R. Engbert, Prof. Dr. M. Holschneider, Prof. Dr. W. Huisinga, Prof. Dr. Ralf Metzler, Prof. Dr. A. Pikovsky, Prof. Dr. S. Reich, Prof. Dr. M. Rosenblum, Prof. Dr. G. Rüdiger, Prof. Dr. T. Scheffer, Prof. Dr. F. Scherbaum, Prof. Dr. J. Selbig, Prof. Dr. F. Spahn

Seminar

Speaker: David Kielpinski, Director of the Australian Attosecond Science Facility, School of Biomolecular and Physical Sciences, Griffith University, Australia

Title: Precision experiments in strong-field and attosecond science * OSA Student Chapter Potsdam (Aushang.pdf)

Time: Fri, June 27, 2014, 10:00am

Place: bldg 28, room 0.108

Abstract:
In strong-field and attosecond science, the interpretation of experiments relies on highly complex theoretical simulations. Often theory and experiment do not agree, throwing these interpretations into doubt. I will describe efforts to achieve highly accurate measurements in strong-field ionisation and high-harmonic generation at the Australian Attosecond Science Facility (AASF). Using atomic hydrogen, we have achieved few-percent accuracy in measuring photoionisation yields, photoelectron energies, and laser peak intensities. Our measurements on H2 strongly challenge theory: the data are known to be accurate at the 3% level, but disagree with state-of-the-art simulations at the tens of percent level. From the H2 data, we have derived an intensity calibration standard that is readily accessible to other laboratories. In another set of experiments, we have demonstrated a new kind of HHG interferometer, based on Gouy phase evolution of the drive laser. With only passive stabilisation, this technique provides zeptosecond timing stability in measuring time delays between HHG pulse pairs. We are preparing experiments to investigate nuclear effects on HHG using the microradian phase precision of this interferometer.

Brief CV: I performed my PhD research in experimental trapped-ion quantum computing at the University of Colorado under the supervision of Dr David Wineland (Nobel 2012). I went on to a postdoctoral fellowship at the Massachusetts Institute of Technology (MIT) with Prof Wolfgang Ketterle (Nobel 2001) performing experiments on Bose-Einstein condensation and was awarded an MIT Pappalardo Fellowship in 2003. This enabled me to start independent work on laser cooling in the lab of Prof Franz Kaertner. I moved to a permanent appointment at Griffith University in 2006 and was appointed Professor in 2012. My research interests focus on the interaction of light and single atoms from the ultracold to the strong-field domains.

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Past NLD Seminars (1994-2007) & (2008 ...)

Students' seminar: Theoretical Physics, PIK, Modeling & TSA Berlin-Potsdam-Colloquia: PhysGesellschaft Berlin, TU Berlin, Pro Physik, AIP, AEI, MPI-KGF, GFZ, HMI, PIK, AWI, Max Planck Institute for the History of Science, Mathematik, DPG Disputationen, & Vorschau UP

Udo Schwarz, Zentrum für Dynamik komplexer Systeme,
Universität Potsdam, Campus Golm Karl-Liebknecht-Str. 24, 14476 Potsdam, building 28, room 2.107
Phone: (+49-331) 977-1658, Fax : (+49-331) 977-1045

Email: Udo.Schwarz AT uni-potsdam.de

DFG SFB 1294

DFG Sonderforschungsbereich 1294 Data assimilation

DFG SPP 1488

DFG Schwerpunktprogramm 1488 Planetmag


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