Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states: I. Experiment

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

Research output: Contribution to journalArticle

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Abstract

In this paper, we report the results of measurements of the intensities and delays of super-radiance decays from excited helium atoms at multiple wavelengths. The experiment was performed using extreme ultraviolet radiation produced by the free electron laser at the SPring-8 Compact SASE Source test accelerator facility as an excitation source. We observed super-radiant transitions on the 1s3p → 1s2s (λ = 502 nm), 1s3d → 1s2p (λ = 668 nm), and 1s3s → 1s2p (λ = 728 nm) transitions. The pulse energy of each transition and its delay time were measured as a function of the target helium gas density. Several interesting features of the data, some of which appear to contradict with the predictions of the simple two-level super-radiance theory, are pointed out.

Original languageEnglish
Article number054301
JournalJournal of the Physical Society of Japan
Volume84
Issue number5
DOIs
Publication statusPublished - May 15 2015

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radiance
helium
wavelengths
excitation
extreme ultraviolet radiation
gas density
helium atoms
free electron lasers
accelerators
time lag
decay
predictions
pulses
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states : I. Experiment. / Nakajima, Kyo; Harries, James R.; Iwayama, Hiroshi; Kuma, Susumu; Miyamoto, Yuki; Nagasono, Mitsuru; Ohae, Chiaki; Togashi, Tadashi; Yabashi, Makina; Shigemasa, Eiji; Sasao, Noboru.

In: Journal of the Physical Society of Japan, Vol. 84, No. 5, 054301, 15.05.2015.

Research output: Contribution to journalArticle

Nakajima, K, Harries, JR, Iwayama, H, Kuma, S, Miyamoto, Y, Nagasono, M, Ohae, C, Togashi, T, Yabashi, M, Shigemasa, E & Sasao, N 2015, 'Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states: I. Experiment', Journal of the Physical Society of Japan, vol. 84, no. 5, 054301. https://doi.org/10.7566/JPSJ.84.054301
Nakajima, Kyo ; Harries, James R. ; Iwayama, Hiroshi ; Kuma, Susumu ; Miyamoto, Yuki ; Nagasono, Mitsuru ; Ohae, Chiaki ; Togashi, Tadashi ; Yabashi, Makina ; Shigemasa, Eiji ; Sasao, Noboru. / Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states : I. Experiment. In: Journal of the Physical Society of Japan. 2015 ; Vol. 84, No. 5.
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