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physics.atom-ph2018★ 33 cited
Superfluorescence, free-induction decay, and four-wave mixing: propagation of free-electron laser pulses through a dense sample of helium ions
James R Harries, Hiroshi Iwayama, Susumu Kuma +9
We report an experimental and numerical study of the propagation of free-electron laser pulses (wavelength 24.3 nm) through helium gas. Ionisation and excitation populates the He$^…
physics.atom-ph2014★ 10 cited
Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states: (I) Experiment
Kyo Nakajima, James R. Harries, Hiroshi Iwayama +8
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 pe…