Simultaneous measurements of superradiance at multiple wavelength from helium excited states: II. Analysis

Chiaki Ohae, James R. Harries, Hiroshi Iwayama, Kentarou Kawaguchi, Susumu Kuma, Yuki Miyamoto, Mitsuru Nagasono, Kyo Nakajima, Itsuo Nakano, Eiji Shigemasa, Noboru Sasao, Satoshi Uetake, Tomonari Wakabayashi, Akihiro Yoshimi, Koji Yoshimura, Motohiko Yoshimura

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Previous experimental studies of superradiance (SR) in multi-level systems have been explainable using the predictions of the well-known simple two-level SR model. However our recent study [K. Nakajima et al., J. Phys. Soc. Jpn. 84, 054301 (2015)] using EUV free-electron laser excitation of helium atoms, where SR was observed at wavelengths of 502, 668, and 728 nm, revealed behaviour which necessitates a full multi-level treatment of the SR development. In this paper, we report simulations of the initial excitation by the FEL pulses, and the subsequent development of multi-level SR. The results of the simulation reproduce the experimental findings, and reveal that competitive SR on two transitions with a common upper level plays an important role in the development of the system.

Original languageEnglish
Article number034301
JournalJournal of the Physical Society of Japan
Volume85
Issue number3
DOIs
Publication statusPublished - 2016

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helium
wavelengths
excitation
helium atoms
free electron lasers
simulation
predictions
pulses

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Simultaneous measurements of superradiance at multiple wavelength from helium excited states : II. Analysis. / Ohae, Chiaki; Harries, James R.; Iwayama, Hiroshi; Kawaguchi, Kentarou; Kuma, Susumu; Miyamoto, Yuki; Nagasono, Mitsuru; Nakajima, Kyo; Nakano, Itsuo; Shigemasa, Eiji; Sasao, Noboru; Uetake, Satoshi; Wakabayashi, Tomonari; Yoshimi, Akihiro; Yoshimura, Koji; Yoshimura, Motohiko.

In: Journal of the Physical Society of Japan, Vol. 85, No. 3, 034301, 2016.

Research output: Contribution to journalArticle

Ohae, Chiaki ; Harries, James R. ; Iwayama, Hiroshi ; Kawaguchi, Kentarou ; Kuma, Susumu ; Miyamoto, Yuki ; Nagasono, Mitsuru ; Nakajima, Kyo ; Nakano, Itsuo ; Shigemasa, Eiji ; Sasao, Noboru ; Uetake, Satoshi ; Wakabayashi, Tomonari ; Yoshimi, Akihiro ; Yoshimura, Koji ; Yoshimura, Motohiko. / Simultaneous measurements of superradiance at multiple wavelength from helium excited states : II. Analysis. In: Journal of the Physical Society of Japan. 2016 ; Vol. 85, No. 3.
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AU - Ohae, Chiaki

AU - Harries, James R.

AU - Iwayama, Hiroshi

AU - Kawaguchi, Kentarou

AU - Kuma, Susumu

AU - Miyamoto, Yuki

AU - Nagasono, Mitsuru

AU - Nakajima, Kyo

AU - Nakano, Itsuo

AU - Shigemasa, Eiji

AU - Sasao, Noboru

AU - Uetake, Satoshi

AU - Wakabayashi, Tomonari

AU - Yoshimi, Akihiro

AU - Yoshimura, Koji

AU - Yoshimura, Motohiko

PY - 2016

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