Synchronized beamline at FLASH2 based on high-order harmonic generation for two-color dynamics studies

Appi, Elisa; Papadopoulou, Christina; Mapa, Jose; Jusko, Christoph; Mosel, Philip; Schoenberg, A.; Stock, Joseph M.; Feigl, Torsten; Ališauskas, Skirmantas; Lang, Tino; Heyl, Christoph M.; Manschwetus, Bastian; Brachmanski, Maciej; Braune, Markus; Lindenblatt, Hannes Carsten; Trost, Florian; Meister, Severin; Schoch, Patrizia; Trabattoni, Andrea; Calegari, Francesca; Treusch, R.; Moshammer, R.; Hartl, Ingmar; Morgner, Uwe; Kovačev, Milutin

doi:10.1063/5.0063225

Cited by 4 publications

(3 citation statements)

References 45 publications

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“…A first highharmonic source has recently been implemented at FLASH 2. 12 It is presently driven by the current OPCPA based laser.…”

Section: Discussionmentioning

confidence: 99%

Multi-pass cell-based nonlinear pulse compression of Yb:YAG pump-probe lasers at FLASH

Seidel,

Viotti,

Alisauskas

et al. 2023

X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation VI

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The majority of user experiments at the high repetition-rate free electron laser (FEL) facility FLASH are of pump-probe type, combining the extreme ultraviolet (XUV) or soft x-ray radiation from the FEL with ultrashort pulses generated by optical lasers. In this contribution, we demonstrate the advantages of using high-power Yb:YAG lasers with subsequent nonlinear pulse compression stages based on multi-pass cells (MPC). The approach enables the combination of hundreds of kHz to MHz repetition-rates, hundreds of watts of average powers and excellent intensity stabilities. We present the characteristics of the MPC-based pump-probe laser at the FLASH plane-grating beamlines. Furthermore, we report pulse compression to 8.2 fs pulse duration and the seeding of an optical parametric amplifier generating mid-IR radiation tunable from 1.4 µm to 16 µm.

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“…A first highharmonic source has recently been implemented at FLASH 2. 12 It is presently driven by the current OPCPA based laser.…”

Section: Discussionmentioning

confidence: 99%

Multi-pass cell-based nonlinear pulse compression of Yb:YAG pump-probe lasers at FLASH

Seidel,

Viotti,

Alisauskas

et al. 2023

X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation VI

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“…The REMI permanent end station, described in more detail in (50,54,55), has recently been upgraded by adding an absorption setup with an XUV spectrometer, which allows us to detect XUV spectra with a resolution of ~30 meV (56). In addition, a beamline for HHG driven by the output of the FLASH2 pump-probe OPCPA (optical parametric chirped-pulse amplification) laser system has been integrated into the FL26 beamline (57)(58)(59). By using the master timing system of the FLASH facility, the OPCPA system is synchronized with the FEL and produces the same pulse pattern.…”

Section: Methodsmentioning

confidence: 99%

“…The optical delay stage of the driving laser system can introduce up to 4 ns of time delay between the HHG and FEL pulses with femtosecond precision, allowing to study the dynamics of processes over a wide time range. After suppression of the remaining driving radiation by a 100-nm-thick Al filter, the HHG pulses are coupled into the FLASH2 beamline by means of a motorized hyperboloidal mirror, described in more detail in ( 57 , 58 ). From this point, the HHG beam propagates parallel to the FEL beam, shifted upward by around 7.5 mm.…”

Section: Methodsmentioning

confidence: 99%

Time-resolving state-specific molecular dissociation with XUV broadband absorption spectroscopy

Magunia,

Rebholz,

Appi

et al. 2023

Sci. Adv.

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The electronic and nuclear dynamics inside molecules are essential for chemical reactions, where different pathways typically unfold on ultrafast timescales. Extreme ultraviolet (XUV) light pulses generated by free-electron lasers (FELs) allow atomic-site and electronic-state selectivity, triggering specific molecular dynamics while providing femtosecond resolution. Yet, time-resolved experiments are either blind to neutral fragments or limited by the spectral bandwidth of FEL pulses. Here, we combine a broadband XUV probe pulse from high-order harmonic generation with an FEL pump pulse to observe dissociation pathways leading to fragments in different quantum states. We temporally resolve the dissociation of a specific O 2 + state into two competing channels by measuring the resonances of ionic and neutral fragments. This scheme can be applied to investigate convoluted dynamics in larger molecules relevant to diverse science fields.

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FLASH free electron laser pump-probe laser concept based on spectral broadening of high-power ytterbium picosecond systems in multi-pass cells

Viotti

Ališauskas

Seidel

et al. 2023

Review of Scientific Instruments

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Within the FLASH2020+ upgrade, the pump-probe laser capabilities of the extreme ultraviolet and soft x-ray free-electron laser (XFEL) FLASH in Hamburg will be extended. In particular, providing wavelength tunability, shorter pulse durations, and reduced arrival time jitter will increase the scientific opportunities and the time resolution for the XFEL-optical laser pump-probe experiments. We present here a novel concept for the pump-probe laser at FLASH that is based on the post-compression of picosecond pulses emitted from high-power Ytterbium:YAG slab amplifiers. Flexible reduction of the pulse duration is facilitated by spectral broadening in pressure-tunable multi-pass cells. As an application, we show the pumping of a commercial optical parametric amplifier with 150 fs post-compressed pulses. By means of an additional difference frequency generation stage, tunable spectral coverage from 1.3 to 16 μm is reached with multi-μJ, sub-150 fs pulses. Finally, a modular reconfiguration approach to the optical setups close to the free-electron laser instruments is implemented. This enables fast installation of the nonlinear frequency converters at the end stations for user operation and flexibility between different instruments in the two experimental halls.

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Synchronized beamline at FLASH2 based on high-order harmonic generation for two-color dynamics studies

Cited by 4 publications

References 45 publications

Multi-pass cell-based nonlinear pulse compression of Yb:YAG pump-probe lasers at FLASH

Multi-pass cell-based nonlinear pulse compression of Yb:YAG pump-probe lasers at FLASH

Time-resolving state-specific molecular dissociation with XUV broadband absorption spectroscopy

FLASH free electron laser pump-probe laser concept based on spectral broadening of high-power ytterbium picosecond systems in multi-pass cells

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