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

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 superfluor...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2015-05, Vol.48 (10), p.105002-9
Main Authors: Harries, James R, Iwayama, Hiroshi, Nagasono, Mitsuru, Togashi, Tadashi, Yabashi, Makina, Kuma, Susumu, Nakajima, Kyo, Miyamoto, Yuki, Ohae, Chiaki, Sasao, Noboru, Shigemasa, Eiji
Format: Article
Language:English
Subjects:
Decay
Emittance
Excitation
Free electron lasers
free-electron laser
Helium atoms
quantum optics
Streak cameras
Superfluorescence
Wavelengths
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/48/10/105002