Observation of Free-Electron-Laser-Induced Collective Spontaneous Emission (Superfluorescence)

被引：36

作者：

Nagasono, Mitsuru ^{[1
]}

Harries, James R. ^{[1
,2
]}

Iwayama, Hiroshi ^{[1
,3
,4
]}

Togashi, Tadashi ^{[5
]}

Tono, Kensuke ^{[5
]}

Yabashi, Makina ^{[1
,5
]}

Senba, Yasunori ^{[5
]}

Ohashi, Haruhiko ^{[1
,5
]}

Ishikawa, Tetsuya ^{[1
]}

Shigemasa, Eiji ^{[1
,3
,4
]}

机构：

[1] RIKEN SPring 8, Sayo, Hyogo 6795148, Japan

[2] JAEA SPring 8, Sayo, Hyogo 6795148, Japan

[3] UVSOR, IMS, Okazaki, Aichi 4448585, Japan

[4] SOKENDAI, Okazaki, Aichi 4448585, Japan

[5] JASRI SPring 8, Sayo, Hyogo 6795198, Japan

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 19期

关键词：

X-RAY LASERS; EXTREME-ULTRAVIOLET; COHERENT; HELIUM; SUPERRADIANCE; RADIATION; OPERATION; TABLE; ATOMS; HE;

D O I：

10.1103/PhysRevLett.107.193603

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have observed and characterized 501.6 nm collective spontaneous emission (superfluorescence) following 1s(2) --> 1s3p excitation of helium atoms by 53.7 nm free-electron laser radiation. Emitted pulse energies of up to 100 nJ are observed, corresponding to a photon number conversion efficiency of up to 10%. We observe the peak intensity to scale as rho(2) and the emitted pulse width and delay to scale as rho(-1), where rho is the atom number density. Emitted pulses as short as 1 ps are observed, which corresponds to a rate around 75 000 times faster than the spontaneous 1s3p --> 1s2s decay rate. To our knowledge, this is the first observation of superfluorescence following pumping in the extreme ultraviolet wavelength region, and extension of the technique to the generation of extreme ultraviolet and x-ray superfluorescence pulses should be straightforward by using suitable atomic systems and pump wavelengths.

引用

页数：5

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