High-intensity femtosecond laser absorption by rare-gas clusters
Li Shao-Hui (李邵辉)ab, Wang Cheng (王成)a, Liu Jian-Sheng (刘建胜)a, Wang Xiang-Xin (王向欣)a, Zhu Pin-Pin (朱频频)a, Li Ru-Xin (李儒新)a, Ni Guo-Quan (倪国权)a, Xu Zhi-Zhan (徐至展)a
a Laboratory for High Intensity Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China; b Department of Physics, Shantou University, Shantou 515063, China
Abstract The energy absorption efficiency of high-intensity ($\sim10^{16}$W/cm^2) femtosecond laser pulses in a dense jet of large rare-gas clusters has been measured. Experimental results show that the energy absorption efficiency is strongly dependent on the cluster size and can be higher than 90%. The measurement of the ion energy indicates that the average ion energies of argon and xenon can be as high as 90 and 100keV, respectively. The dependence of the average energy of the ions on the cluster size is also measured. At comparatively low gas backing pressure, the average ion energies of argon and xenon increase with increasing gas backing pressure. The average ion energy of argon becomes saturated gradually with further increase of the gas backing pressure. For xenon, the average ion energy drops a little after the gas backing pressure exceeds 9 bar ($3.2\times 10^5$ atoms/cluster). The result showing the existence of a maximum average ion energy has been interpreted within the framework of the microplasma sphere model.
Received: 17 June 2003
Revised: 15 July 2003
Accepted manuscript online:
(Ultrafast processes; optical pulse generation and pulse compression)
Fund: Project supported by the National Basic Research Special Foundation (Grant No G1999075200), the National Natural Science Foundation of China (Grant No 29890210) and Shanghai Foundation of Science & Technology (Grant No 0159nm022).
Cite this article:
Li Shao-Hui (李邵辉), Wang Cheng (王成), Liu Jian-Sheng (刘建胜), Wang Xiang-Xin (王向欣), Zhu Pin-Pin (朱频频), Li Ru-Xin (李儒新), Ni Guo-Quan (倪国权), Xu Zhi-Zhan (徐至展) High-intensity femtosecond laser absorption by rare-gas clusters 2003 Chinese Physics 12 1229
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