Laser-driven amplification of soft X-rays by parametric stimulated emission in neutral gases

被引：51

作者：

Seres, J. ^{[1
,2
]}

Seres, E. ^{[1
]}

Hochhaus, D. ^{[3
,4
,5
]}

Ecker, B. ^{[3
,4
]}

Zimmer, D. ^{[3
,4
,6
]}

Bagnoud, V. ^{[3
]}

Kuehl, T. ^{[3
,4
]}

Spielmann, C. ^{[1
,2
]}

机构：

[1] Univ Jena, Inst Opt & Quantum Elect, D-07743 Jena, Germany

[2] Univ Wurzburg, Dept Phys 1, D-97074 Wurzburg, Germany

[3] GSI Helmholtz Ctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany

[4] Johannes Gutenberg Univ Mainz, Dept Phys, D-55128 Mainz, Germany

[5] EMMI Extreme Matter Inst, D-64291 Darmstadt, Germany

[6] Univ Paris 11, LPGP, UMR 8578, LASERIX CLUPS, F-91405 Orsay, France

来源：

NATURE PHYSICS | 2010年 / 6卷 / 06期

基金：

奥地利科学基金会;

关键词：

HIGH-HARMONIC GENERATION; NUCLEAR-CHARGE RADII; NONNORMAL INCIDENCE; RAMAN-SCATTERING; ALPHA-TRANSITION; COHERENT; SPECTROSCOPY; GAIN; IONIZATION; SATURATION;

D O I：

10.1038/NPHYS1638

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a new method for parametric amplification of soft-X-ray radiation. The laser-driven amplifier is based on parametric stimulated emission and is seeded with high-order-harmonic radiation generated in the same medium. The exponential increase of the soft-X-ray yield with increasing atomic density is experimentally demonstrated for two different sets of laser parameters. A small-signal gain up to 8 x 10(3) is obtained in both experiments at about 40 eV in argon using 350-fs-long laser pulses and with 6-fs-long ones at about 260 eV in helium, respectively. This new scheme reduces the pumping threshold for lasing with a comparable conversion efficiency into the millijoule level, which is about two orders of magnitude smaller compared with the conventional plasma X-ray lasers. With a simple model, we can estimate the necessary experimental conditions for identifying the spectral range and the magnitude of the maximum gain, which are in reasonable agreement with our measurements.

引用

页码：455 / 461

页数：7

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