Dr. Wolfram Helml

Physik Department E11
Lehrstuhl für Laser- und Röntgenphysik
Technische Universität München TUM
James-Franck-Straße 1
85748 Garching, Germany
Phone: +49 / 89 / 289-12861
Email: wolfram.helml@tum.de

Research Expertise and Interests

Higher-order harmonic generation (HHG) with various laser wavelengths and geometries
Control & measurement of carrier–envelope phase (CEP) and field-dependent aspects for few-cycle laser pulses
Attosecond dynamics on solids and surfaces
Development & temporal characterization of (X)UV & X-ray sources
Dynamics of free electrons and relaxation pathways in liquid water
Understanding fundamental quantum phenomena and their relation to processes in the macroscopic world

Curriculum Vitae

Education and Research Experience

2014 - present	Marie-Curie research fellow and postdoctoral scholar Lehrstuhl für Laser- und Röntgenphysik, Prof. Reinhard Kienberger, Technische Universität München, Germany
2012 - 2014	Marie-Curie research fellow and postdoctoral scholar Project: Single-shot X-ray Pulse Duration Acquisition & Time-resolved X-ray Spectroscopy (SiXPAc & T-ReX), in cooperation with Dr. R. N. Coffee and Prof. P. Bucksbaum SLAC, Stanford University, Menlo Park, California, USA
07/2012	Promotion with distinction (summa cum laude) towards Dr. rer. nat. (PhD) Thesis title: Development & Characterization of Sources for high-energy, high-intensity coherent Radiation Supervisor: Prof. Reinhard Kienberger Max-Planck-Institut für Quantenoptik, Garching & Technische Universität München, Munich, Germany
01/2007	Diploma in physics (Mag. rer. nat.) Thesis title: Der Einfluss von CP-Verletzung auf Neutralino-3-Körper Zerfälle in Fermionen der Dritten Generation Supervisor: Prof. Alfred Bartl Institute for Theoretical Physics, Universität Wien, Vienna, Austria
1997	Military service in HSNS (Austrian military sports school)
1996	Matura (school leaving exam) Akademisches Gymnasium, Linz, Austria

Fellowships

2012- 2015	Marie Curie International Outgoing Fellowship in cooperation with Technische Universität München & Stanford University
2007 - 2011	Member of the International Max Planck Research School on Advanced Photon Science (IMPRS-APS)
2007	Scholarship of the Max Planck Society

List of Publications

N. Hartmann, G. Hartmann, R. Heider, M. S. Wagner, M. Ilchen, J. Buck, A. O. Lindahl, C. Benko, J. Grünert, J. Krzywinski, J. Liu, A. A. Lutman, A. Marinelli, T. Maxwell, A. A. Miahnahri, S. P. Moeller, M. Planas, J. Robinson, A. K. Kazansky, N. M. Kabachnik, J. Viefhaus, T. Feurer, R. Kienberger, R. N. Coffee & W. Helml: „Attosecond time–energy structure of X-ray free-electron laser pulses”, Nature Photonics 12, 215–220 (2018)
M. C. Hoffmann, I. Grguraš, C. Behrens, C. Bostedt, J. Bozek, H. Bromberger, R. N. Coffee, J. T. Costello, L. F. DiMauro, Y. Ding, G. Doumy, W. Helml, M. Ilchen, R. Kienberger, S. Lee, A. R. Maier, T. Mazza, M. Meyer, M. Messerschmidt, S. Schorb, W. Schweinberger, K. Zhang & A. L. Cavalieri: „Femtosecond profiling of shaped x-ray pulses“, New Journal of Physics, Volume 20, March 2018
W. Helml, I. Grguraš, P. N. Jurani, S. Düsterer, T. Mazza, A. R. Maier, N. Hartmann, M. Ilchen, G. Hartmann, L. Patthey, C. Callegari, J. T. Costello, M. Meyer, R. N. Coffee, A. L. Cavalieri, R. Kienberger, „Ultrashort Free-Electron Laser X-ray Pulses“, Appl. Sci. 7, 915–956 (2017)
Y. Ding, C. Behrens, R. Coffee, F.-J. Decker, P. Emma, C. Field, W. Helml, Z. Huang, P. Krejcik, J. Krzywinski, H. Loos, A. Lutman, A. Marinelli, T. J. Maxwell & J. Turner, Generating femtosecond X-ray pulses using an emittance-spoiling foil in free-electron lasers, Applied Physics Letters 107, 191104 (2015)

N. Hartmann, W. Helml, A. Galler, M. R. Bionta, J. Grünert, S. L. Molodtsov, K. R. Ferguson, S. Schorb, M. L. Swiggers, S. Carron, C. Bostedt, J.-C. Castagna, J. Bozek, J. M. Glownia, D. J. Kane, A. R. Fry, W. E. White, C. P. Hauri, T. Feurer & R. N. Coffee, Sub-femtosecond precision measurement of relative X-ray arrival time for free-electron lasers, Nature Photonics 8, 706–709 (2014)

W. Helml*, A. R. Maier*, W. Schweinberger, I. Grguras, P. Radcliff, G. Doumy, C. Roedig, J. Gagnon, M. Messerschmidt, S. Schorb, C. Bostedt, F. Grüner, L. F. DiMauro, D. Cubaynes, J. D. Bozek, T. Tschentscher, J. T. Costello, M. Meyer, R. Coffee, S. Düsterer, A. L. Cavalieri & R. Kienberger, Measuring the temporal structure of few-femtosecond free-electron laser X-ray pulses directly in the time domain, Nature Photonics 8, 950–957 (2014)

G. Marcus, W. Helml, X. Gu, Y. Deng, R. Hartmann, T. Kobayashi, L. Strueder, R. Kienberger & F. Krausz, Sub-femtosecond K-shell excitation with a few-cycle infrared laser field, Physical Review Letters 108, 023201 (2012)

S. Düsterer, P. Radcliffe, C. Bostedt, J. Bozek, A. L. Cavalieri, R. Coffee, J. T. Costello, D. Cubaynes, L. F. DiMauro, Y. Ding, G. Doumy, W. Helml, W. Schweinberger, R. Kienberger, A. R. Maier, F. Grüner, M. Messerschmidt, V. Richardson, C. Roedig, T. Tschentscher & M. Meyer, Femtosecond X-ray Pulse Length Characterization at the LCLS Free Electron Laser, New Journal of Physics 13, 093024 (2011)

M. Fieß, B. Horváth, T. Wittmann, W. Helml, Y. Cheng, B. Zeng, Z. Xu, A. Scrinzi, F. Krausz & R. Kienberger, Attosecond control of tunneling ionization and electron trajectories, New Journal of Physics 13, 033031 (2011)

T. Wittmann, B. Horvath, W. Helml, M. G. Schätzel, X. Gu, A. L. Cavalieri, G. G. Paulus & R. Kienberger, Single-Shot Carrier-Envelope Phase Measurement of Few-Cycle Laser Pulses, Nature Physics 5, 357–362 (2009)

J. Kammler, A. Kypta, R. Hofmann, K. Kerschner, M. Grund, K. Sihorsch, C. Steinwender, Th. Lambert, W. Helml & F. Leisch, TIMI 3 flow after primary angioplasty is an important predictor for outcome in patients with acute myocardial infarction, Clinical Research in Cardiology 98, 165–170 (2009)

A. L. Cavalieri, E. Goulielmakis, B. Horváth, W. Helml, M. Schultze, M. Fieß, V. Pervak, L. Veisz, V. Yakovlev, M. Uiberacker, A. Apolonski, F. Krausz & R. Kienberger, Intense 1.5-cycle near infrared laser waveforms and their use for the generation of ultra-broadband soft-x-ray harmonic continua, New Journal of Physics 9, 242 (2007)