Newsletter February 2015
Dear colleagues and friends of the HI-Jena,
welcome to the first issue of the newsletter of the Helmholtz Institute Jena in 2015.
We are happy to provide you with informations and news about the HI-Jena and its activities.
Helmholtz Institute Jena
Entering new realms with table-top coherent extreme ultraviolet and soft x-ray sources
Table-top sources of extreme ultraviolet to soft x-ray radiation, realized by applying high harmonic generation to ultrashort pulse lasers, have become vital complements or alternatives to large-scale facilities, such as synchrotrons and free electron lasers. Although they have found diverse applications a major bottleneck is the inherently low conversion efficiency and, therefore low photon flux of HHG souces. In addition, the limited repetition rate and average output power of conventional laser systems hinders higher photon flux and prevents possible applications, e.g. in photoelectron spectroscopy, microscopy or coincidence detection. A joint experiment of the Institute of Applied Physics and the Helmholtz-Institute Jena recently demonstrated an unprecedented high photon flux and repetition rate by utilizing high average power fiber laser systems, adequate pulse compression and optimized HHG conditions.
A state-of-the-art fiber chirped pulse amplifier that incorporates the coherent combination of up to 4 main amplifier channels delivers up to 160 W of average power with sub-300 fs pulse duration and variable repetition rates and pulse energies. Subsequently, the pulses coming from this system are coupled to a gas-filled hollow-core fiber where they undergo spectral broadening. The pulse duration is reduced to less than 30 fs by several reflections on chirped mirrors. The ultrashort pulses are then focused into a xenon gas jet with an intensity of roughly 1014 W/cm2 and generate high harmonics of the driving laser wavelength. An optimization procedure yields more than 3·1013 photons/s (143µW) in a single harmonic at 30eV, which is at least an order of magnitude higher than previous results . An extension to shorter wavelengths can be achieved by applying a second compression step to achieve sub-8fs pulses, which are then focused to a higher intensity of 1015 W/cm2 onto neon or helium gas jets. A photon flux of 3·109 photons/s is achieved for a 1% bandwidth at 120eV and the cutoff of the harmonics can be extended into the important water-window spectral region above 280 eV .
The demonstrated sources will foster various applications in microscopy, spectroscopy or surface science. For example, the soft x-ray source can applied for time-resolved sub-10 nm imaging potentially in combination with element sensitivity. High photon flux and high repetition rate sources in the extreme ultraviolet are envisioned to bring experiments based on coincidence detection to a new level and help unraveling the course of chemical reactions. Moreover they will allow exciting highly energetic dipole transitions in li-like heavy ions and measuring the ultra-short livetimes of the corresponding excited states.
 S. Hädrich, A. Klenke, J. Rothhardt, M. Krebs, A. Hoffmann, O. Pronin, V. Pervak, J. Limpert, and A. Tünnermann, "High photon flux table-top coherent extreme ultraviolet source," Nat Phot. 8, 779–783 (2014).
 J. Rothhardt, S. Hädrich, A. Klenke, S. Demmler, A. Hoffmann, T. Gotschall, T. Eidam, M. Krebs, J. Limpert, and A. Tünnermann, "53 W average power few-cycle fiber laser system generating soft x rays up to the water window," Opt. Lett. 39, 5224 (2014).
News and Announcements
Annual Report 2014
It is the same procedure as every year: The Annual Report 2014 will illustrate excellence of the research performed at our institute during the last year. It will be assembled by our institute members Daniel Seipt and Marc Günther.
We hope for your active participation to make the 2014 annual report as successfull as the last year's.
The deadline for the submission is: March 31st, 2015.
Please send your contributions to: firstname.lastname@example.org
The annual report will also contain a list of all publications with participation of the HI Jena. Please check whether all your publications from 2014 are registered in the HI Jena publication database: http://www.hi-jena.de/de/publikationen/referierte-publikationen/
If you find any of your papers missing please give a notice to Günter Weber: email@example.com
Novel Light Sources from Laser-Plasma Interactions
The last decade has witnessed an explosion of activity in the development of novel radiation sources based on laser-plasma interactions (LPI), fueled by the wide availability of high-power lasers, with many promising applications. This workshop aims to bring together theorists and experimentalists working across a wide range of topics, including:
- Attosecond pulse sources from LPI
- X-ray and X-FEL sources from LPI
- Pump-probe experiments and applications of LPI sources
- Filamentation and THz generation
- γ-ray sources and QED processes
- Parametric amplification of short pulses
- Thomson and Compton sources
9th International Symposium on Swift Heavy Ions in Matter
SHIM 2015 will be the 9th International Symposium in a series which was started in Caen (France) in 1989. The conference brings together scientists performing research with high-energy heavy ions in various fields, including radiation effects in solids, atomic physics, plasma physics, radiation biology and medicine, as well as nanotechnology. SHIM focuses on basic as well as applied research, including both theoretical and experimental aspects.
The sessions will comprise invited lectures as well as oral and poster presentations. There will be no parallel sessions. Proceedings are planned as special issue of Nuclear Instruments and Methods B. The conference will take place in the "darmstadtium" convention Center located in the heart of Darmstadt.
SHIM 2015 will consist of 3 1/2 days of conference, starting at 9:00 am on Monday, May 18, and ending early afternoon on Thursday, May 21. The welcome reception will be on Sunday evening, May 17.
European Summer School 2015: LIGHT! An introduction to modern Physics of Light
We would like to draw your attention to this year's European Summer School, which is part of the International Year of Light and its applications: LIGHT ! An introduction to modern Physics of Light
The school is open to students in physics who have completed three years of studies and to young PhD students.
The European Summer School of the University of Strasbourg is a prestigious one-week meeting of students from all over Europe. Students present their research projects and attend lectures on one of the most recent topics in physics presented by internationally known scientists. The 2015 Summer School will be dedicated to the physics of Light, and will offer an enthusiastic and educational introduction to some of the most recent research areas in this field.
The European Summer School will be open for applications at least until May 17, 2015:
Conference web page: http://esc.u-strasbg.fr/
XXIX International Conference on Photonic, Electronic, and Atomic Collisions (ICPEAC)
The ICPEAC conference is held biennially since 1958 in order to promote the growth and exchange of information in the fields of collisions involving photons, electrons, ions, atoms, molecules, clusters, surfaces, and exotic particles. Recent expansions of the conference scope include collision with cold targets and attosecond science.
The scientific programme will consist of invited Plenary Lectures and Progress Reports. In addition, a number of oral Special Reports will be selected from the contributed abstracts. Plenary talks are of general interest to all participants. Progress Reports and Special Reports will be arranged in two parallel sessions, and describe recent work in different subfields. In particular, the Special Reports are short presentations on the most recent advances. Posters will be presented in afternoon sessions.
The XXIX ICPEAC will be hosted by the Universidad Autónoma de Madrid and the Consejo Superior de Investigaciones Científicas. The
convention venue will be the Toledo Congress Centre, just 70 km from Madrid (Spain). It is located in the historical centre of the city of Toledo, declared a World Heritage Site by UNESCO in 1986 for its extensive cultural and monumental heritage and historical co-existence of Christian, Muslim and Jewish cultures.
More information and registration: http://icpeac2015.com
Broadband XUV polarimetry of high harmonics from plasma surfaces using multiple Fresnel reflections
T. Hahn, J. Bierbach, C. Rödel, D. Hemmers, M. Yeung, B. Dromey, S. Fuchs, A. Galestian, S. Kuschel, M. Zepf, G. Paulus, and G. Pretzler
Appl. Phys. B 118, 241 (2015)
Characterization of a double-sided Si(Li) strip Compton polarimeter
K.-H. Blumenhagen, A. Gumberidze, R. Märtin, N. Schell, U. Spillmann, G. Weber, and Th. Stöhlker
J. Phys.: Conf. Ser. 583, 012043 (2015)
Compton polarimetry using double-sided segmented x-ray detectors
G. Weber, K.-H. Blumenhagen, H. Bräuning, H. Ding, S. Fritzsche, S. Hess, R. Märtin, U. Spillmann, A. Surzhykov, S. Trotsenko, D. F. A. Winters, V. A. Yerokhin, and T. Stöhlker
J. Phys.: Conf. Ser. 583, 012041 (2015)
Reduction of X-ray generation in high-intensity laser ion acceleration
B. Aurand, S. Kuschel, C. Rödel, O. Jäckel, J. Polz, B. Elkin, H. Zhao, A. Karmakar, P. Gibbon, M. Kaluza, and T. Kühl
Appl. Phys. B 118, 247 (2015)
Interaction of twisted light with many-electron atoms and ions
A. Surzhykov, D. Seipt, V. G. Serbo, and S. Fritzsche
Phys. Rev. A 91, 013403 (2015)
Lifting shell structures in the dynamically assisted Schwinger effect in periodic fields
A. Otto, D. Seipt, D. Blaschke, B. Kämpfer, and S. Smolyansky
Phys. Lett. B 740, 335 (2015)
Real-time and Sub-wavelength Ultrafast Coherent Diffraction Imaging in the Extreme Ultraviolet
M. Zürch, J. Rothhardt, S. Hädrich, S. Demmler, M. Krebs, J. Limpert, A. Tünnermann, A. Guggenmos, U. Kleineberg, and C. Spielmann
Sci. Rep. 4, 7356 (2014)
Relativistic calculations of the isotope shifts in highly charged Li-like ions
N. A. Zubova, Y. S. Kozhedub, V. M. Shabaev, I. I. Tupitsyn, A. V. Volotka, G. Plunien, C. Brandau, and Th. Stöhlker
Phys. Rev. A 90, 062512 (2014)
53 W average power few-cycle fiber laser system generating soft x rays up to the water window
J. Rothhardt, S. Hädrich, A. Klenke, S. Demmler, A. Hoffmann, T. Gotschall, T. Eidam, M. Krebs, J. Limpert, and A. Tünnermann
Opt. Lett. 39, 5224 (2014)
High photon flux table-top coherent extreme-ultraviolet source
S. Hädrich, A. Klenke, J. Rothhardt, M. Krebs, A. Hoffmann, O. Pronin, V. Pervak, J. Limpert, and A. Tünnermann
Nat. Photonics 8, 779 (2014)
Performance Scaling of Ultrafast Laser Systems by Coherent Addition of Femtosecond Pulses
J. Limpert, A. Klenke, M. Kienel, S. Breitkopf, T. Eidam, S. Hädrich, C. Jauregui, and A. Tünnermann
IEEE J. Sel. Top. Quantum Electron. 20, 0901810 (2014)