Scientific Opportunities with an X-ray Free-Electron Laser Oscillator

Adams, Bernhard W.; Aeppli, G.; Allison, Thomas G.; Baron, Alfred Q. R.; Bucksbaum, P. H.; Chumakov, A. I.; Corder, Christopher; Cramer, Stephen P.; DeBeer, Serena; Ding, Yuntao; Evers, Jörg; Frisch, J.; Fuchs, Matthias; Grübel, G.; Hastings, J. B.; Heyl, Christoph M.; Holberg, Leo; Huang, Zhirong; Ishikawa, Tetsuya; Kaldun, Andreas; Kim, Kwang‐Je; Kołodziej, Tomasz; Krzywiński, J.; Li, Zheng; Liao, Wen-Te; Lindberg, Ryan; Madsen, Anders; Maxwell, Timothy; Monaco, G.; Nelson, Keith A.; Pálffy, Adriana; Porat, Gil; Qin, Weilun; Raubenheimer, T.O.; Reis, David A.; Röhlsberger, Ralf; Santra, Robin; Schoenlein, R. W.; Schünemann, Volker; Shpyrko, Oleg; Shvyd'Ko, Yuri; Shwartz, Sharon; Singer, Andrej; Sinha, Sunil K.; Sutton, M. R.; Tamasaku, Kenji; Wille, Hans‐Christian; Yabashi, Makina; Ye, Jun; Zhu, Dan

doi:10.48550/arxiv.1903.09317

Cited by 11 publications

(14 citation statements)

References 128 publications

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“…As a whole, our results provide a comprehensive solution for the linear scattering regime of thin-film x-ray cavity QED with Mössbauer nuclei or ultra-narrow resonances, resolving previous discrepancies and revealing the connection between different existing theoretical approaches. As an outlook, we expect this progress in the understanding of the low-excitation sector to provide a solid theoretical foundation for describing phenomena in the non-linear and correlated quantum dynamics regime of this platform, which may be accessible at current and upcoming x-ray facilities [6,12] such as x-ray free electron lasers, where the first experiment on nuclear quantum optics has recently been performed [38].…”

Section: Discussion and Summarymentioning

confidence: 99%

“…That is the system is excited by a collimated and highly monochromatic * beam from a modern low-emittance x-ray facility such as a synchrotron or an x-ray free electron laser in conjunction with a high-resolution monochromator. At anticipated light sources such as x-ray free electron laser oscillators [6], similar setups are to be expected.…”

Section: Effective One-dimensional Problemmentioning

confidence: 99%

“…In recent years, quantum optics with x-rays has become an active field of research [1][2][3][4][5][6], driven by the progress in high photon intensities and beam quality at modern light sources [6][7][8][9]. As one promising platform, Mössbauer nuclei have received considerable attention.…”

Section: Introductionmentioning

confidence: 99%

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Ab initio quantum models for thin-film x-ray cavity QED

Lentrodt,

Heeg,

Keitel

et al. 2020

Preprint

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We develop two ab initio quantum approaches to thin-film x-ray cavity quantum electrodynamics with spectrally narrow x-ray resonances, such as those provided by Mössbauer nuclei. The first method is based on a few-mode description of the cavity, and promotes and extends existing phenomenological few-mode models to an ab initio theory. The second approach uses analytically-known Green's functions to model the system. The two approaches not only enable one to ab initio derive the effective few-level scheme representing the cavity and the nuclei in the low-excitation regime, but also provide a direct avenue for studies at higher excitation, involving non-linear or quantum phenomena. The ab initio character of our approaches further enables direct optimizations of the cavity structure and thus of the photonic environment of the nuclei, to tailor the effective quantum optical level scheme towards particular applications. To illustrate the power of the ab initio approaches, we extend the established quantum optical modeling to resonant cavity layers of arbitrary thickness, which is essential to achieve quantitative agreement for cavities used in recent experiments. Further, we consider multi-layer cavities featuring electromagnetically induced transparency, derive their quantum optical few-level systems ab initio, and identify the origin of discrepancies in the modeling found previously using phenomenological approaches as arising from cavity field gradients across the resonant layers.

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Section: Discussion and Summarymentioning

confidence: 99%

Section: Effective One-dimensional Problemmentioning

confidence: 99%

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Ab initio quantum models for thin-film x-ray cavity QED

Lentrodt,

Heeg,

Keitel

et al. 2020

Preprint

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“…The effects of limited coherence will be modeled and discussed separately in the Results. Fully coherent x-ray pulses can be delivered by seeded XFELs [35][36][37][38][39][40], an XFEL oscillator (XFELO) [41][42][43][44][45][46], or their combination [47,48]. We would like to highlight here the very recent report of successful seeding at the Pohang Accelerator Laboratory XFEL in South Korea, which demonstrated 40 times higher peak brightness than in self-amplified spontaneous emission, with pulses close to the Fourier limit and energies up to 14.6 keV [40].…”

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confidence: 99%

Transient nuclear inversion by X-Ray Free Electron Laser in a tapered x-ray waveguid

Chen,

Lin,

Wang

et al. 2021

Preprint

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By restricting the spatial energy transmission of an electromagnetic wave, dielectric waveguides transmit light over long distances at sustained intensity. Waveguides have been used in the microwave and optical range to maintain strong signal intensities in connection with lasers, but guiding of intense short-wavelength radiation such as x-rays has proven more cumbersome. Here we investigate theoretically how tapered x-ray waveguides can focus and guide radiation from x-ray free electron lasers. Elliptical waveguides using a cladding material with high atomic number such as platinum can maintain an x-ray intensity up to three orders of magnitude larger than in free space. This feature can be used to significantly enhance resonant interactions of x-rays, for instance driving nuclear transitions up to transient nuclear population inversion.This could be the first breakthrough in nuclear state population control. Our results anticipate the important role of tapered x-ray waveguides in the emerging field of x-ray quantum optics with nuclear transitions.

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“…To drastically increase the photon flux, a double bunch FEL (DBFEL) scheme at LCLS has been investigated [37][38][39]. To generate fully coherent hard X-ray pulses, an X-ray FEL oscillator (XFELO) [40][41][42][43] has been proposed. Since the lasing medium is an electron bunch in a long, typically 100 m, undulator, XFELO requires a total of few hundred meters long diamond Bragg crystal cavity wrapped around the undulator.…”

mentioning

confidence: 99%

Design and Characteristics of a Population Inversion X-ray Laser Oscillator

Halavanau,

Benediktovitch,

Lutman

et al. 2019

Preprint

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Oscillators are at the heart of optical lasers, providing stable transform limited pulses. In contrast, X-ray free electron lasers use self-amplified spontaneous emission (SASE), resulting in large stochastic intensity and spectral fluctuations. Amplified spontaneous emission (ASE) of the Kα1 line has been recently observed for Ne gas, Cu compounds and Mn solutions at the LCLS and SACLA X-ray free electron lasers (XFELs), using an X-ray SASE pulse as a pump to create population inversion. Here we describe the physics and realization of an X-ray laser oscillator (XLO) based on periodically pumping a Cu compound gain medium in a tunable Bragg cavity with a SASE pulse train, generating intense (∼ 5 x 10 10 ph/pulse), fully coherent, transform limited 8 keV pulses with 48 meV spectral resolution. We also discuss extending these results to other elements to operate XLO from about 5 to 12 keV, improving X-ray-based research beyond current capabilities.

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Scientific Opportunities with an X-ray Free-Electron Laser Oscillator

Cited by 11 publications

References 128 publications

Ab initio quantum models for thin-film x-ray cavity QED

Ab initio quantum models for thin-film x-ray cavity QED

Transient nuclear inversion by X-Ray Free Electron Laser in a tapered x-ray waveguid

Design and Characteristics of a Population Inversion X-ray Laser Oscillator

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