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 language | English |
|---|---|
| Article number | 054301 |
| Journal | Journal of the Physical Society of Japan |
| Volume | 84 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 15 2015 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
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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 journal › Article
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TY - JOUR
T1 - Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states
T2 - I. Experiment
AU - Nakajima, Kyo
AU - Harries, James R.
AU - Iwayama, Hiroshi
AU - Kuma, Susumu
AU - Miyamoto, Yuki
AU - Nagasono, Mitsuru
AU - Ohae, Chiaki
AU - Togashi, Tadashi
AU - Yabashi, Makina
AU - Shigemasa, Eiji
AU - Sasao, Noboru
PY - 2015/5/15
Y1 - 2015/5/15
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84928634422&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84928634422&partnerID=8YFLogxK
U2 - 10.7566/JPSJ.84.054301
DO - 10.7566/JPSJ.84.054301
M3 - Article
AN - SCOPUS:84928634422
VL - 84
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 5
M1 - 054301
ER -