Demonstration of self-seeding in a hard-X-ray free-electron laser

Amann, J.; Berg, William J.; Бланк, В. Д.; Decker, F.J.; Ding, Yuantao; Emma, P.; Feng, Yiping; Frisch, J.; Fritz, David; Hastings, J. B.; Huang, Zhirong; Krzywiński, J.; Lindberg, Ryan; Loos, H.; Lutman, Alberto; Nuhn, H.‐D.; Ratner, Daniel; Rzepiela, Jeffrey A.; Shu, Deming; Shvyd’ko, Yu. V.; Spampinati, S.; Stoupin, Stanislav; Terentyev, Sergey; Trakhtenberg, E.; Walz, D.; Welch, J.; Wu, Juhao; Zholents, A.; Zhu, Diling

doi:10.1038/nphoton.2012.180

Cited by 634 publications

(437 citation statements)

References 18 publications

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“…It is, however, known that the modern FELs are operating in the self-amplified stimulated emission (SASE) mode, 68,69 which provides a temporally incoherent, spiky structure of the laser-pulse envelope. The question might arise as to how much the specific temporal profile of the laser pulse affects the results.…”

Section: Pulse Shapementioning

confidence: 99%

Nonthermal graphitization of diamond induced by a femtosecond x-ray laser pulse

2013

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Diamond irradiated with an ultrashort intense laser pulse in the regime of photon energies from soft up to hard x rays can undergo a phase transition to graphite. This transition is induced by an excitation of electrons from the valence band or from atomic deep shells of the material into its conduction band, which is followed by a transient rapid change of the interatomic potential. Such a nonthermal phase transition occurs on a femtosecond time scale, shortly after or even during the laser pulse. In this work we show that the duration of the graphitization depends on the incoming photon energy: the higher the photon energy is, the longer the secondary electron cascading which promotes the electrons into the conduction band will take. The transient kinetics of the electronic and atomic processes during the graphitization is analyzed in detail. The damage threshold fluence is calculated in the broad photon energy range and is found to be always ∼0.7 eV/atom in terms of the average dose absorbed per atom. It is confirmed that the temporal characteristics of a femtosecond laser pulse (at a fixed pulse duration and fluence) do not significantly influence the transient damage kinetics. Finally, the influence of an additional surface layer of high-Z material on the damage within diamond is discussed.

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Section: Pulse Shapementioning

confidence: 99%

Nonthermal graphitization of diamond induced by a femtosecond x-ray laser pulse

2013

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“…With the advent of x-ray FELs in the last 10 years [2][3][4][5], a new era of x-ray science has arrived. Currently, the light source community is continuing to develop more sophisticated schemes in pursuit of, e.g., fast polarization switching [5][6][7][8][9][10][11][12][13][14][15][16][17], full coherence [18][19][20][21][22][23][24], compact x-ray configurations [25][26][27][28], and multicolor operation [29][30].…”

mentioning

confidence: 99%

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

Deng

Zhang

Feng

et al. 2014

Phys. Rev. ST Accel. Beams

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Polarization switching of light sources is required over a wide spectral range to investigate the symmetry of matter. In this paper, we report the first experimental demonstration of the crossed-planar undulators technique at a seeded free-electron laser, which holds great promise for the full control and fast switching of the polarization of short-wavelength radiation. In the experiment, the polarization state of the coherent radiation at the second harmonic of the seed laser is switched successfully. The experimental results confirm the theory and pave the way for applying the crossed-planar undulators technique for seeded x-ray free-electron lasers.

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“…When comparing different x-ray sources for their coherence and stability properties, there is a clear progression from tubes to storage rings to x-ray high-gain, single-pass free-electron lasers [9,10], then self-seeded Self-Amplified Spontaneous Emission (SASE) XFELs (SSS-XFEL) [11,12], and to the proposed XFELO, and, finally, to the nuclear-resonance-stabilized XFELO (NRS-XFELO) discussed here. Contemporary storage ring sources emit x rays into hundreds or thousands of transverse modes and, depending on the monochromator, typically thousands of longitudinal modes.…”

Section: Introductionmentioning

confidence: 99%

X-ray comb generation from nuclear-resonance-stabilized x-ray free-electron laser oscillator for fundamental physics and precision metrology

Adams

Kim

2015

Phys. Rev. ST Accel. Beams

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An x-ray free-electron laser oscillator (XFELO) is a next-generation x-ray source, similar to free-electron laser oscillators at VUV and longer wavelengths but using crystals as high-reflectivity x-ray mirrors. Each output pulse from an XFELO is fully coherent with high spectral purity. The temporal coherence length can further be increased drastically, from picoseconds to microseconds or even longer, by phase-locking successive XFELO output pulses, using the narrow nuclear resonance lines of nuclei such as 57 Fe as a reference. We show that the phase fluctuation due to the seismic activities is controllable and that due to spontaneous emission is small. The fluctuation of electron-bunch spacing contributes mainly to the envelope fluctuation but not to the phase fluctuation. By counting the number of standing-wave maxima formed by the output of the nuclear-resonance-stabilized (NRS) XFELO over an optically known length, the wavelength of the nuclear resonance can be accurately measured, possibly leading to a new length or frequency standard at x-ray wavelengths. A NRS-XFELO will be an ideal source for experimental x-ray quantum optics as well as other fundamental physics. The technique can be refined for other, narrower resonances such as 181 Ta or 45 Sc.

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Demonstration of self-seeding in a hard-X-ray free-electron laser

Cited by 634 publications

References 18 publications

Nonthermal graphitization of diamond induced by a femtosecond x-ray laser pulse

Nonthermal graphitization of diamond induced by a femtosecond x-ray laser pulse

Polarization switching demonstration using crossed-planar undulators in a seeded free-electron laser

X-ray comb generation from nuclear-resonance-stabilized x-ray free-electron laser oscillator for fundamental physics and precision metrology

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