X-ray Free-Electron Laser

Ueda, Kiyoshi

doi:10.3390/app8060879

Cited by 10 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Rabi frequencies are defined as previously in Eq. (42), which leaves us with the derivation of the explicit form of the decay rates Γ ge = Γ γ ge + Γ nr ge . For magnetic multipole radiation, the decay rate Γ γ ge between the states |e and |g was expressed in terms of the matrix element of the magnetic multipole operator g|M Lσ |e in Eq.…”

Section: Nuclear Splitting For Isolated Atoms or Ionsmentioning

confidence: 99%

“…In fact, X-ray free-electron lasers (XFELs) already allow to generate coherent light of up to 20 keV in energy, thereby covering some of the low-energy nuclear excited states [42]. This has led to the first successful XFELexcitation of a nuclear state [43] and is expected to advance the already established field of nuclear quantum op-arXiv:2001.08320v2 [nucl-th] 30 Jun 2020 tics [7,44,45].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The theory of direct laser excitation of nuclear transitions

et al. 2020

View full text Add to dashboard Cite

A comprehensive theoretical study of direct laser excitation of a nuclear state based on the density matrix formalism is presented. The nuclear clock isomer 229m Th is discussed in detail, as it could allow for direct laser excitation using existing technology and provides the motivation for this work. The optical Bloch equations are derived for the simplest case of a pure nuclear two-level system and for the more complex cases taking into account the presence of magnetic sub-states, hyperfine-structure and Zeeman splitting in external fields. Nuclear level splitting for free atoms and ions as well as for nuclei in a solid-state environment is discussed individually. Based on the obtained equations, nuclear population transfer in the low-saturation limit is reviewed. Further, nuclear Rabi oscillations, power broadening and nuclear twophoton excitation are considered. Finally, the theory is applied to the special cases of 229m Th and 235m U, being the nuclear excited states of lowest known excitation energies. The paper aims to be a didactic review with many calculations given explicitly.

show abstract

Section: Nuclear Splitting For Isolated Atoms or Ionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The theory of direct laser excitation of nuclear transitions

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Another example is the serial femtosecond crystallography (SFX) based on a liquid jet ablated by an x-ray free electron laser (XEFL) [20]. XFELs have a peak brilliance that is over 1 × 10 9 times brighter than that of synchrotron sources, greatly facilitating the study of weak scattering from small crystals [21,22]. The short XFEL pulse is comparable with the femtosecond-scale chemical time, enabling time-resolved investigation of the reaction dynamics [23].…”

Section: Introductionmentioning

confidence: 99%

Response of ∼100 micron water jets to intense nanosecond laser blasts

et al. 2022

View full text Add to dashboard Cite

We performed an experimental study on water microjets of 100 microns in radius ablated in air by both green (532 nm) and near infrared (1064 nm) nanosecond laser pulses with up to 1100 mJ per pulse. We show this affordable and accessible experimental apparatus captures the essence of the water jet response after being ablated by an intense laser pulse. The results reveal that ∼3.5% of laser pulse energy enters the water jet and half reaches the nozzle orifice as far as 50 times the jet diameter away from the ablation point through internal reflections. The energy density absorbed by the nozzle orifice exceeds the damage threshold of stainless steel, causing microexplosions and formation of a liquid sheet near the nozzle orifice.

show abstract

“…Nowadays, intense X-ray lasers can be generated via high-harmonic generation (HHG) [21][22][23][24] from intense laser fields or the use of free-electron lasers [25][26][27][28]. The rapid advance of intense laser technologies, particularly chirped pulse amplification technique (CPA) [29], makes laser fields being with a wide range of frequencies, high intensities, and durations [30,31].…”

Section: Introductionmentioning

confidence: 99%

Intense X-ray laser-induced proton emission from halo nuclei

Wu¹,

Liu²

2022

Preprint

View full text Add to dashboard Cite

We investigate the intense X-ray laser-induced proton emission from halo nuclei within the framework of a nonperturbative quantum S-matrix approach. We have analytically deduced the angular differential as well as the total multi-photon rates of the proton emissions. For a linearly polarized X-ray laser field, we find that the angular distributions of proton emission sensitively depend on the laser frequency and show an interesting petal structure with increasing the laser frequency as well as the number of absorbed photons. Meanwhile, we find the Coulomb repulsion potential between the proton and the remainder nucleus has a strong hindering effect on the total multi-photon rates of the proton emissions, and leads to the blue shifts of the multi-photon transition frequency. Moreover, the polarization effects of laser fields on total rates of proton emission have also been addressed. We find that the polarized ellipticity corresponding to the maximum of the total rates depend on the laser frequency showing a transition from perturbative to nonperturbative proton emission. The underlying mechanism of the above findings is uncovered, and some implications are discussed.

show abstract

X-ray Free-Electron Laser

Abstract: During the last decades, the advent of the short-wavelength Free Electron Lasers (FELs) in the range from extreme ultraviolet (XUV) to hard X-rays has opened a new research avenue for the investigations of ultrafast electronic and structural dynamics in any form of matter[...]

Cited by 10 publications

References 27 publications

The theory of direct laser excitation of nuclear transitions

The theory of direct laser excitation of nuclear transitions

Response of ∼100 micron water jets to intense nanosecond laser blasts

Intense X-ray laser-induced proton emission from halo nuclei

Contact Info

Product

Resources

About