News

Ursula Keller wins “Swiss Nobel” Marcel Benoist Prize- for pioneering work in ultrafast lasers

Farewell: the NCCR MUST ended - on June 30, 2022

MUST2022 Conference- a great success!

New scientific highlights- by MUST PIs Wörner, Chergui, and Richardson

FELs of Europe prize for Jeremy Rouxel- “Development or innovative use of advanced instrumentation in the field of FELs”

Ruth Signorell wins Doron prizefor pioneering contributions to the field of fundamental aerosol science

New FAST-Fellow Uwe Thumm at ETH- lectures on Topics in Femto- and Attosecond Science

International Day of Women and Girls in Science- SSPh asked female scientists about their experiences

New scientific highlight- by MUST PIs Milne, Standfuss and Schertler

EU XFEL Young Scientist Award for Camila Bacellar,beamline scientist and group leader of the Alvra endstation at SwissFEL

Prizes for Giulia Mancini and Rebeca Gomez CastilloICO/IUPAP Young Scientist Prize in Optics & Ernst Haber 2021

Nobel Prize in Chemistry awarded to RESOLV Member Benjamin List- for the development of asymmetric organocatalysis

Hans Jakob Wörner invited to give the „New Horizons Solvay Lectures” - online, October 5, 12 and 19

Unusual keynote talk at an international scientific conference- Do photons show gender bias?

NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules

Attosecond pump-probe setup

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Location		Contact
ETH Zurich Wolfgang-Pauli-Str. 10 HCI G222 8093 Zurich		Martin Huppert Tel +41 44 633 4368 7mak.rtx7ine4.hh3upf#ped%rtq2@py#hyr.s.t&chs%emj#.ee9thf2z.q0chn
Setup / Configuration XUV/IR or XUV/UV-VIS delay line Piezo driven delays from 10 as to 3 ps Active stabilization with kHz bandwidth Stability in the 10 as range Absolute path length detection XUV and IR beams can be modified separately (spectral filtering, polarization control, frequency conversion) Overall XUV reflectivity ~ 40% (30-150 eV)		Literature M. Fieß, M. Schultze, E. Goulielmakis, B. Dennhardt, J. Gagnon, M. Hofstetter, R. Kienberger and F. Krausz, Versatile apparatus for attosecond metrology and spectroscopy“, Rev. Sci. Instrum. 81, 093103 (2010). M. Holler, “Attosecond strong field control”, Ph.D. Thesis, ETH Zürich, Nr. 18782, 2010. F. Schapper, “Attosecond structure of high-order harmonics”, Ph.D. Thesis, ETH Zürich, Nr. 18783, 2010.
The top image shows the design of the attosecond interferometer using a semi-infinite gas cell as XUV source and a velocity-map imaging (VMI) spectrometer as detector. The bottom image shows the realization in our laboratory.		Our setup generates a controlled attosecond delay between two ultrashort pulses: an infrared or ultraviolet and an extreme-ultraviolet (XUV) pulse. The attosecond interferometer represents a versatile tool to realize pump-probe measurements of electronic dynamics in polyatomic molecules. It can be combined with an XUV spectrometer for transient absorption measurements, a VMI spectrometer for angle-resolved photoelectron measurements or with a photoelectron time-of-flight spectrometer for liquid samples. We are using a sophisticated stabilization scheme to stabilize the interferometer to arbitrary delays. The feedback loop using interferences of a He-Ne laser beam is realized fully digitally in a real-time computer system, which allows loop rates in the kilohertz range. In addition, a white- light interferometer gives information about the absolute path length difference between the two arms of the interferometer.
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