中国物理B ›› 2006, Vol. 15 ›› Issue (4): 697-701.doi: 10.1088/1009-1963/15/4/008

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Study on the interaction of intense femtosecond laser pulses with nanometre-sized hydrogen clusters

郑莉1, 王成1, 徐至展1, 李邵辉2, 刘丙辰2, 倪国权2, 李儒新2   

  1. (1)State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Shanghai 201800, China; (2)State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2005-08-27 修回日期:2006-02-07 出版日期:2006-04-20 发布日期:2006-04-20
  • 基金资助:
    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).

Study on the interaction of intense femtosecond laser pulses with nanometre-sized hydrogen clusters

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)   

  1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2005-08-27 Revised:2006-02-07 Online:2006-04-20 Published:2006-04-20
  • Supported by:
    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).

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摘要： 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\tm106Pa) 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.

关键词: protons, hydrogen clusters, intense femtosecond laser pulse

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.

Key words: protons, hydrogen clusters, intense femtosecond laser pulse

中图分类号:  (Plasma and collective effects in clusters)

  • 36.40.Gk
36.40.Mr (Spectroscopy and geometrical structure of clusters) 52.38.Bv (Rayleigh scattering; stimulated Brillouin and Raman scattering) 52.50.Jm (Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))