Observation of an optical vortex beam from a helical undulator in the XUV region

Kaneyasu, T.; Hikosaka, Y.; Fujimoto, Masaki; Iwayama, H.; Hosaka, Masahito; Shigemasa, E.; Katoh, Masahiro

doi:10.1107/s1600577517009626

Cited by 24 publications

(12 citation statements)

References 17 publications

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“…A tandem undulator, which consists of two undulators placed in series, is a powerful light source, bringing unique abilities—for example, polarization switching 2 – 4 and combination of different wavelength regimes 5 , 6 – in spectroscopic studies of matter. Moreover, interference between the radiation from the two undulators can be controlled by a phase shifter magnet which delays the electron motion, and is used to control the polarization of light in the crossed undulator scheme 7 – 10 and to verify the generation of structured light such as vortex beams 11 – 13 and vector beams 14 in synchrotron light sources. The waveform of each wave packet constituting the radiation has a double-pulsed time structure, reflecting the sequential undulating motion of electrons traveling through the tandem undulator.…”

Section: Introductionmentioning

confidence: 99%

Double-pulsed wave packets in spontaneous radiation from a tandem undulator

Kaneyasu

Hosaka

Mano

et al. 2022

Sci Rep

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We verify that each wave packet of spontaneous radiation from two undulators placed in series has a double-pulsed temporal profile with pulse spacing which can be controlled at the attosecond level. Using a Mach–Zehnder interferometer operating at ultraviolet wavelengths, we obtain the autocorrelation trace for the spontaneous radiation from the tandem undulator. The results clearly show that the wave packet has a double-pulsed structure, consisting of a pair of 10-cycle oscillations with a variable separation. We also report the characterization of the time delay between the double-pulsed components in different wavelength regimes. The excellent agreement between the independent measurements confirms that a tandem undulator can be used to produce double-pulsed wave packets at arbitrary wavelength.

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Section: Introductionmentioning

confidence: 99%

Double-pulsed wave packets in spontaneous radiation from a tandem undulator

Kaneyasu

Hosaka

Mano

et al. 2022

Sci Rep

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“…Twisted light with orbital angular momentum (OAM) projection Lz = 0 [1] has found numerous applications in quantum optics and information, optomechanics, biology, astrophysics, and so forth [2][3][4][5][6][7][8]. Along with the diffraction techniques, such photons can be generated by charged particles in undulators [9][10][11][12][13][14][15], via non-linear Thomson or Compton scattering [15][16][17][18][19][20][21], during Cherenkov and transition radiation [22], via channeling in crystals [23,24], etc. However, despite the potential use in particle and nuclear physics [6], the highest energy of the twisted photons achieved so far does not exceed a few keV [7].…”

Section: Introductionmentioning

confidence: 99%

Generation of vortex particles via generalized measurements

et al. 2022

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The hard X-ray twisted photons and relativistic massive particles with orbital angular momentum – vortex electrons, muons, protons, etc. – have many potential applications in high-energy and nuclear physics. However, such states can be obtained so far mainly via diffraction techniques, not applicable for relativistic energies. Here we show that the vortex states of different particles, including hadrons, ions, and nuclei, can be generated in a large class of processes with two final particles simply by altering a postselection protocol. Thanks to entanglement and to the uncertainty relations, an evolved state of a final particle becomes twisted if the momentum azimuthal angle of the other particle is measured with a large uncertainty. We give several examples, including Cherenkov and undulator radiation, particle collisions with intense laser beams, $$e\mu \rightarrow e\mu , ep \rightarrow ep$$ e μ → e μ , e p → e p . This technique can be adapted for ultrarelativistic lepton and hadron beams of linear colliders, and it can also facilitate the development of sources of X-ray and $$\gamma $$ γ -range twisted photons at storage rings and free-electron lasers.

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“…In the visible region, the common method is use of fork holograms, spiral phase plates [22], lens-based mode converters [23], and q-plates [24]. In the X-ray region, highharmonic radiation from a helical undulator [25,26,27] and/or coherent emission from spirally-bunched electrons produced by combination of a laser and undulator [28,29,30] seem very promising methods. Less well established is generation of twisted gamma rays.…”

Section: Introductionmentioning

confidence: 99%

Alternative method of generating gamma rays with orbital angular momentum

Tanaka,

Sasao

2021

Preprint

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We propose a new method of generating gamma rays with orbital angular momentum (OAM). Accelerated partially-stripped ions are used as an energy upconverter. Irradiating an optical laser beam with OAM on ultrarelativistic ions, they are excited to a state of large angular momentum. Gamma rays with OAM are emitted in their deexcitation process. We examine the excitation cross section and deexcitation rate.

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Observation of an optical vortex beam from a helical undulator in the XUV region

Cited by 24 publications

References 17 publications

Double-pulsed wave packets in spontaneous radiation from a tandem undulator

Double-pulsed wave packets in spontaneous radiation from a tandem undulator

Generation of vortex particles via generalized measurements

Alternative method of generating gamma rays with orbital angular momentum

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