Optical beam transport to a remote location for low jitter pump-probe experiments with a free electron laser

Cinquegrana, Paolo; Cleva, Stefano; Demidovich, Alexander; Gaio, G.; Ivanov, Rosen; Kurdi, G.; Nikolov, Ivaylo; Sigalotti, Paolo; Danailov, M. B.

doi:10.1103/physrevstab.17.040702

Cited by 47 publications

(38 citation statements)

References 21 publications

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“…It is demonstrated that at FEL experimental stations, the timing jitter generated due to a free space propagation of ~100 m and due to folding mirrors can be controlled with 5 fs accuracy via currently available technology3435.…”

Section: Resultsmentioning

confidence: 99%

Temporally-coherent terawatt attosecond XFEL synchronized with a few cycle laser

Kumar

Parc

Landsman

et al. 2016

Sci Rep

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Attosecond metrology using laser-based high-order harmonics has been significantly advanced and applied to various studies of electron dynamics in atoms, molecules and solids. Laser-based high-order harmonics have a limitation of low power and photon energies. There is, however, a great demand for even higher power and photon energy. Here, we propose a scheme for a terawatt attosecond (TW-as) X-ray pulse in X-ray free-electron laser controlled by a few cycle IR pulse, where one dominant current spike in an electron bunch is used repeatedly to amplify a seeded radiation to a terawatt level. This scheme is relatively simple, compact, straightforward, and also produces a temporally and spectrally clean pulse. The viability of this scheme is demonstrated in simulations using Pohang accelerator laboratory (PAL)-XFEL beam parameters.

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Section: Resultsmentioning

confidence: 99%

Temporally-coherent terawatt attosecond XFEL synchronized with a few cycle laser

Kumar

Parc

Landsman

et al. 2016

Sci Rep

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“…Two bendable mirrors in Kirkpatrick-Baez configuration focused the x rays into a sub-100 µm spot. The same optical laser beam (λ = 780 nm) that seeds the FEL was used for pumping the sample, ensuring an extremely low jitter (<10 fs) between the pump and the probe [26,27]. The optical pump and the FEL probe beams were kept almost collinear (<2 • apart), introducing a negligible temporal spread over the measured area.…”

Section: Methodsmentioning

confidence: 99%

Dynamics of the MnAs α/β-Striped Microstructure and of the Fe Magnetization Reversal in Fe/MnAs/GaAs(001): An Optical-Laser Pump–Free-Electron-Laser Probe Scattering Experiment

et al. 2017

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It was shown recently that the Fe magnetization reversal in the Fe/MnAs/GaAs(001) epitaxial system, attained by temperature control of the regular stripe pattern of the MnAs α-and β-phases, can also be driven by an ultrashort optical laser pulse. In the present time-resolved scattering experiment, we address the dynamics of the MnAs α-β self-organized stripe pattern induced by a 100 fs optical laser pulse, using as a probe the XUV radiation from the FERMI free-electron laser. We observe a loss in the diffraction intensity from the ordered α-β stripes that occurs at two characteristic timescales in the range of~10 −12 and~10 −10 s. We associate the first intensity drop with ultrafast electron-lattice energy exchange processes within the laser-MnAs interaction volume and the second with thermal diffusion towards the MnAs/GaAs interface. With the support of model calculations, the observed dynamics are interpreted in terms of the

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“…Optical transport of ultrashort pulses generated by optical laser from its optical table to the experimental stations, which are~100 m away, requires ultra-high vacuum transport system. S. Schulz et al [44] and P. Cinquegrana et al [45] have demonstrated that a carefully designed laser beam transport, including a free space propagation of 150 m and a number of beam folding mirrors allows one to keep the timing fluctuations to less than 4 femtoseconds RMS.…”

Section: Terawatt-attosecond Soft X-ray Pulse Generation Tables and Smentioning

confidence: 99%

Terawatt-Isolated Attosecond X-ray Pulse Using a Tapered X-ray Free Electron Laser

2017

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High power attosecond (as) X-ray pulses are in great demand for ultrafast dynamics and high resolution microscopy. We numerically demonstrate the generation of a~230 attosecond, 1.5 terawatt (TW) pulse at a photon energy of 1 keV, and a 115 attosecond, 1.2 TW pulse at a photon energy of 12.4 keV, using the realistic electron beam parameters such as those of Korean X-ray free electron laser (XFEL) in a tapered undulator configuration. To compensate the energy loss of the electron beam and maximize its radiation power, a tapering is introduced in the downstream section of the undulator. It is found that the tapering helps in not only amplifying a target radiation pulse but also suppressing the growth of satellite radiation pulses. Tapering allows one to achieve a terawatt-attosecond pulse only with a 60 m long undulator. Such an attosecond X-ray pulse is inherently synchronized to a driving optical laser pulse; hence, it is well suited for the pump-probe experiments for studying the electron dynamics in atoms, molecules, and solids on the attosecond time-scale. For the realization of these experiments, a high level of synchronization up to attosecond precision between optical laser and X-ray pulse is demanded, which can be possible by using an interferometric feedback loop.

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Optical beam transport to a remote location for low jitter pump-probe experiments with a free electron laser

Cited by 47 publications

References 21 publications

Temporally-coherent terawatt attosecond XFEL synchronized with a few cycle laser

Temporally-coherent terawatt attosecond XFEL synchronized with a few cycle laser

Dynamics of the MnAs α/β-Striped Microstructure and of the Fe Magnetization Reversal in Fe/MnAs/GaAs(001): An Optical-Laser Pump–Free-Electron-Laser Probe Scattering Experiment

Terawatt-Isolated Attosecond X-ray Pulse Using a Tapered X-ray Free Electron Laser

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