Abstract The interaction of intense femtosecond laser pulses with hydrogen clusters has been experimentally studied. The hydrogen clusters were produced from expansion of high-pressure hydrogen gas (backed up to 8×1016Pa) into vacuum through a conical nozzle cryogenically cooled by liquid nitrogen. The average size of hydrogen clusters was estimated by Rayleigh scattering measurement and the maximum proton energy of up to 4.2keV has been obtained from the Coulomb explosion of hydrogen clusters under 2×1016 W/cm2 laser irradiation. Dependence of the maximum proton energy on cluster size and laser intensity was investigated, indicating the correlation between the laser intensity and the cluster size. The maximum proton energy is found to be directly proportional to the laser intensity, which is consistent with the theoretical prediction.
Received: 27 August 2005
Revised: 07 February 2006
Accepted manuscript online:
(Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))
Fund: Project supported by the National Key Basic Research Special Foundation of China (Grant No G1999 075200), and in part by the National High Technology Development Program of China (Grant No 2003AA84ts06).
Cite this article:
Zheng Li (郑莉), Wang Cheng (王成), Li Shao-Hui (李邵辉), Liu Bing-Chen (刘丙辰), Ni Guo-Quan (倪国权), Li Ru-Xin (李儒新), Xu Zhi-Zhan (徐至展) Study on the interaction of intense femtosecond laser pulses with nanometre-sized hydrogen clusters 2006 Chinese Physics 15 697
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