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

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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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Nakajima, K., Harries, J. R., 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, 84(5), [054301]. https://doi.org/10.7566/JPSJ.84.054301