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arXiv · 1602.03703

High-repetition-rate and high-photon-flux 70 eV high-harmonic source for coincidence ion imaging of gas-phase molecules

Jan Rothhardt·Steffen Hädrich·Yariv Shamir·Maxim Tschnernajew·Robert Klas·Armin Hoffmann·Getnet K. Tadesse·Arno Klenke·Thomas Gottschall·Tino Eidam·Jens Limpert·Andreas Tünnermann·Rebecca Boll·Cedric Bomme·Hatem Dachraoui·Benjamin Erk·Michele Di Fraia·Daniel A. Horke·Thomas Kierspel·Terence Mullins·Andreas Przystawik·Evgeny Savelyev·Joss Wiese·Tim Laarmann·Jochen Küpper·Daniel Rolles
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Abstract

Unraveling and controlling chemical dynamics requires techniques to image structural changes of molecules with femtosecond temporal and picometer spatial resolution. Ultrashort-pulse x-ray free-electron lasers have significantly advanced the field by enabling advanced pump-probe schemes. There is an increasing interest in using table-top photon sources enabled by high-harmonic generation of ultrashort-pulse lasers for such studies. We present a novel high-harmonic source driven by a 100 kHz fiber laser system, which delivers 10$^{11}$ photons/s in a single 1.3 eV bandwidth harmonic at 68.6 eV. The combination of record-high photon flux and high repetition rate paves the way for time-resolved studies of the dissociation dynamics of inner-shell ionized molecules in a coincidence detection scheme. First coincidence measurements on CH$_3$I are shown and it is outlined how the anticipated advancement of fiber laser technology and improved sample delivery will, in the next step, allow pump-probe studies of ultrafast molecular dynamics with table-top XUV-photon sources. These table-top sources can provide significantly higher repetition rates than the currently operating free-electron lasers and they offer very high temporal resolution due to the intrinsically small timing jitter between pump and probe pulses.

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Jan Rothhardt, Steffen Hädrich, Yariv Shamir, Maxim Tschnernajew, Robert Klas, Armin Hoffmann, Getnet K. Tadesse, Arno Klenke, Thomas Gottschall, Tino Eidam, Jens Limpert, Andreas Tünnermann, Rebecca Boll, Cedric Bomme, Hatem Dachraoui, Benjamin Erk, Michele Di Fraia, Daniel A. Horke, Thomas Kierspel, Terence Mullins, Andreas Przystawik, Evgeny Savelyev, Joss Wiese, Tim Laarmann, Jochen Küpper, Daniel Rolles. 2016-02-11. High-repetition-rate and high-photon-flux 70 eV high-harmonic source for coincidence ion imaging of gas-phase molecules. https://doi.org/10.1364/oe.24.018133

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