Single-atom response of helium atoms to pulses from an EUV free-electron laser: Implications for the subsequent development of superfluorescence

James R. Harries; Chiaki Ohae; Susumu Kuma; Kyo Nakajima; Tadashi Togashi; Yuki Miyamoto; Noboru Sasao; Hiroshi Iwayama; Mitsuru Nagasono; Makina Yabashi; Eiji Shigemasa

doi:10.1103/PhysRevA.94.063416

Single-atom response of helium atoms to pulses from an EUV free-electron laser: Implications for the subsequent development of superfluorescence

James R. Harries, Chiaki Ohae, Susumu Kuma, Kyo Nakajima, Tadashi Togashi, Yuki Miyamoto, Noboru Sasao, Hiroshi Iwayama, Mitsuru Nagasono, Makina Yabashi, Eiji Shigemasa

Research Institute for Interdisciplinary Science

Research output: Contribution to journal › Article

3 Citations (Scopus)

Abstract

Using multilevel (161-level) numerical simulations beyond the rotating-wave approximation, we investigate the single-atom response of helium to intense pulses of radiation with properties characteristic of a self-amplified spontaneous emission (SASE) free-electron laser (FEL) source, and central wavelengths resonant with 1snp excitation (n=3,4). The results show a complete breakdown of the two-level approximation and suggest that, under typical experimental conditions, levels other than the resonant level are significantly populated. We discuss the implications for the subsequent development of superfluorescence (a collective effect) from the excited atomic medium and compare the results to recent experiments.

Original language	English
Article number	063416
Journal	Physical Review A
Volume	94
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevA.94.063416
Publication status	Published - Dec 22 2016

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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Harries, J. R., Ohae, C., Kuma, S., Nakajima, K., Togashi, T., Miyamoto, Y., Sasao, N., Iwayama, H., Nagasono, M., Yabashi, M., & Shigemasa, E. (2016). Single-atom response of helium atoms to pulses from an EUV free-electron laser: Implications for the subsequent development of superfluorescence. Physical Review A, 94(6), [063416]. https://doi.org/10.1103/PhysRevA.94.063416

Single-atom response of helium atoms to pulses from an EUV free-electron laser : Implications for the subsequent development of superfluorescence. / Harries, James R.; Ohae, Chiaki; Kuma, Susumu; Nakajima, Kyo; Togashi, Tadashi; Miyamoto, Yuki ; Sasao, Noboru; Iwayama, Hiroshi; Nagasono, Mitsuru; Yabashi, Makina; Shigemasa, Eiji.

In: Physical Review A, Vol. 94, No. 6, 063416, 22.12.2016.

Research output: Contribution to journal › Article

Harries, James R. ; Ohae, Chiaki ; Kuma, Susumu ; Nakajima, Kyo ; Togashi, Tadashi ; Miyamoto, Yuki ; Sasao, Noboru ; Iwayama, Hiroshi ; Nagasono, Mitsuru ; Yabashi, Makina ; Shigemasa, Eiji. / Single-atom response of helium atoms to pulses from an EUV free-electron laser : Implications for the subsequent development of superfluorescence. In: Physical Review A. 2016 ; Vol. 94, No. 6.

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abstract = "Using multilevel (161-level) numerical simulations beyond the rotating-wave approximation, we investigate the single-atom response of helium to intense pulses of radiation with properties characteristic of a self-amplified spontaneous emission (SASE) free-electron laser (FEL) source, and central wavelengths resonant with 1snp excitation (n=3,4). The results show a complete breakdown of the two-level approximation and suggest that, under typical experimental conditions, levels other than the resonant level are significantly populated. We discuss the implications for the subsequent development of superfluorescence (a collective effect) from the excited atomic medium and compare the results to recent experiments.",

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