A streak camera study of superfluorescence at multiple wavelengths from helium atoms excited using free electron laser pulses

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

Research output: Contribution to journalArticle

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Abstract

Abstract We report the observation of superfluourescence at wavelengths (in air) of 501.6 nm, 667.8 nm, and 728.1 nm following the excitation of helium atoms with free-electron laser pulses at wavelengths of 53.7 nm (n = 3 excitation) and 52.2 nm (n = 4 excitation). The observed wavelengths of the superfluorescence pulses correspond to 1s3p-1s2s, 1s3d-1s2p, and 1s3s-1s2p transitions. Observation of superfluorescence on these transitions implies either competing cascade decays, or direct excitation of non-dipole allowed transitions. We have studied the time structure of the emitted pulses using a streak camera, and the results cannot be explained by straightforward considerations using the usual model for two-level superfluorescence.

Original languageEnglish
Article number105002
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume48
Issue number10
DOIs
Publication statusPublished - May 28 2015

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streak cameras
helium atoms
free electron lasers
pulses
wavelengths
excitation
cascades
air
decay

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

Cite this

A streak camera study of superfluorescence at multiple wavelengths from helium atoms excited using free electron laser pulses. / Harries, James R.; Iwayama, Hiroshi; Nagasono, Mitsuru; Togashi, Tadashi; Yabashi, Makina; Kuma, Susumu; Nakajima, Kyo; Miyamoto, Yuki; Ohae, Chiaki; Sasao, Noboru; Shigemasa, Eiji.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 48, No. 10, 105002, 28.05.2015.

Research output: Contribution to journalArticle

Harries, James R. ; Iwayama, Hiroshi ; Nagasono, Mitsuru ; Togashi, Tadashi ; Yabashi, Makina ; Kuma, Susumu ; Nakajima, Kyo ; Miyamoto, Yuki ; Ohae, Chiaki ; Sasao, Noboru ; Shigemasa, Eiji. / A streak camera study of superfluorescence at multiple wavelengths from helium atoms excited using free electron laser pulses. In: Journal of Physics B: Atomic, Molecular and Optical Physics. 2015 ; Vol. 48, No. 10.
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AU - Yabashi, Makina

AU - Kuma, Susumu

AU - Nakajima, Kyo

AU - Miyamoto, Yuki

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AU - Sasao, Noboru

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N2 - Abstract We report the observation of superfluourescence at wavelengths (in air) of 501.6 nm, 667.8 nm, and 728.1 nm following the excitation of helium atoms with free-electron laser pulses at wavelengths of 53.7 nm (n = 3 excitation) and 52.2 nm (n = 4 excitation). The observed wavelengths of the superfluorescence pulses correspond to 1s3p-1s2s, 1s3d-1s2p, and 1s3s-1s2p transitions. Observation of superfluorescence on these transitions implies either competing cascade decays, or direct excitation of non-dipole allowed transitions. We have studied the time structure of the emitted pulses using a streak camera, and the results cannot be explained by straightforward considerations using the usual model for two-level superfluorescence.

AB - Abstract We report the observation of superfluourescence at wavelengths (in air) of 501.6 nm, 667.8 nm, and 728.1 nm following the excitation of helium atoms with free-electron laser pulses at wavelengths of 53.7 nm (n = 3 excitation) and 52.2 nm (n = 4 excitation). The observed wavelengths of the superfluorescence pulses correspond to 1s3p-1s2s, 1s3d-1s2p, and 1s3s-1s2p transitions. Observation of superfluorescence on these transitions implies either competing cascade decays, or direct excitation of non-dipole allowed transitions. We have studied the time structure of the emitted pulses using a streak camera, and the results cannot be explained by straightforward considerations using the usual model for two-level superfluorescence.

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