Open AccessExperimental study on Kα X-ray emission from intense femtosecond laser-solid interactions
Author(s) -
M. Xu,
Liming Chen,
Yutong Li,
Xiaohui Yuan,
Yunquan Liu,
Kazuhisa Nakajima,
T. Tajima,
Zhaohua Wang,
Zhiyi Wei,
Wei Zhao,
Jie Zhang
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.353
Subject(s) - femtosecond , laser , energy conversion efficiency , physics , x ray , optics , photon , atomic physics , photon energy , electron , intensity (physics) , materials science , optoelectronics , nuclear physics
The characteristics of Kα X-ray sources generated by p-polarized femtosecond laser-solid interactions are experimentally studied in the relativistic regime. By use of knife-edge image technique and a single-photon-counting X-ray CCD camera, we obtaine the source size, the spectrum and the conversion efficiency of the Kα X-ray sources. The experimental results show that the conversion efficiency of Kα photons reaches an optimum value of 7.08×10-6/sr at the laser intensity of 1.6×1018W/cm2, which is different from the Reich's simulation results (Reich et al., 2000 Phys. Rev. Lett. 84 4846). We find that about 10% of laser energy is converted into the forward hot electrons at the laser intensity of 1.6×1018W/cm2.